What life form was the first on earth?

bacteria

amphibians

land plants

dinosaurs

Answers

Answer 1
bacteria was the first life form :)

Related Questions

Which new animal adaptation may be favored if average

temperatures in a temperate forest decreases by 25

degrees C over 1500 years?

Answers

Answer:

If the average temperatures of temperate forests fell by about 25ºC during the period of 1500 years, the natural modification of the animals that would be favored would be that which allows an adaptation to the new climatic circumstances by the fauna of said forests, that is , to the notable drop in temperature. Thus, for example, animals would develop more voluminous furs, which would allow them to heat their bodies in a better way.

Suppose a trait is controlled by a gene that has one dominant allele (G) and one recessive allele (g).

Which of the following crosses would be expected to produce the greatest variety of genotypes among the offspring?

Answers

Answer:

Gg x Gg

Explanation:

Gg x Gg crosses would be expected to produce the greatest variety of genotypes among the offspring.

What is Punnett Square?

A Punnett square is defined as a graphical representation of the possible genotypes of the offspring resulting from a particular cross or breeding event. Creating a Punnett square requires knowledge of the genetic makeup of the parents.

For a monohybrid cross, Punnett squares are 2X2 squares containing four boxes where each represents a fertilization event between the original gametes. While the second type is used to predict the outcome of breeding experiments where two traits are being observed and the Punnett square is large with sixteen boxes.

In the above example, if a Gg x Gg cross occurs, the genotype for the children will be Gg, which would be expected to produce the greatest diversity of genotypes among the offspring, i.e. 100%.

Thus, Gg x Gg crosses would be expected to produce the greatest variety of genotypes among the offspring.

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✎﹏☾✦☁️❣️ Briefly explain the process of photosynthesis .❣️☁️​

Answers

Answer:

hope this will help u

Explanation:

photosynthesis is the process in which plant make their own food with the help of sunlight,water and carbon dioxide. water and carbon dioxide are raw materials in photosynthesis because they help to prepare their food.During photosynthesis, plants take in carbon dioxide and water from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.

Explanation:

PHOTOSYNTHESIS

This is a process in which green plants and other organisms make their own food from simple inorganic substances which are sunlight ,CO2 and chlorophyll.

a cross between a white horse and a chesnut horse produce all light brown horses

Answers

Answer:

Incomplete dominance

Explanation:

- Eijiro <3

Answer:

incorrect.

Explanation:

there is a possibility. but in reality color does not effect the foal.

My Friesians grandfather was an Akhal teke that was gold. He gave birth to all black offspring as you can see in the attachment.

how many molecules of glucose are produced in photosynthesis

Answers

Answer: One molecule of glucose (C6H12O6) and six molecules of oxygen (O2)

Explanation:

Six molecules of carbon dioxide (CO2) combine with six molecules of water (H2O) in the presence of light energy. This produces one molecule of glucose (C6H12O6) and six molecules of oxygen (O2)

The chromosome are arranged to show
ll
13
O A. homologous pairs
O B. tetrads
OC. independent assortment
O D. nucleotides

Answers

Answer:

D. nucleotides

i'm not sure

The answer is D nucleotides

How can a chloroplast, a structure found in plant cells but not in animal cells, provide energy for BOTH plants and animals?

Answers

Answer:

Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll which is essential for photosynthesis. Chlorophyll traps sunlight and uses it to prepare food for plants by the process of photosynthesis.

factors that affect blood flow through the bone marrow​

Answers

Insufficient amount of nutrients such as iron, vitamin B12, or folate, affects the bone marrow's ability to produce normal red blood cells; those produced may be small (microcytic), large (macrocytic), and/or may have decreased amounts of hemoglobin inside them (hypochromic).

define reflex action in your own words

Answers

Answer:

reflex action is a way for your body to react to different stimuli. this action is automatic and unplanned and it is done by your body to prevent any further damage.

eg:

pulling you hand when you touch a hot pot

Which statement best predicts why a cell's progression through the cell cycle might be halted by the G1/S checkpoint?

Answers

Answer:

The missing options are:

A. Spindle fibers have not correctly attached to chromosomes.

B. Damage occurred to DNA when it was being copied in G1.

C. There are not enough nucleotides available to construct new DNA.

D. Proteins necessary for M phase of the cell cycle have not been produced.

The correct option is C.There are not enough nucleotides available to construct new DNA.

Explanation:

During the G1 phase, the cell grows in size since it prepares its organelles and molecule combinations for the next phase of the cell cycle, the S phase. Before the cell transitions to the S phase, it has to pass through a checkpoint that makes sure that there are no mutations, it has grown enough, and has the necessary molecules for the next phase, which is the synthesis of DNA. If there are not enough nucleotides, the cell will not be able to synthesize new DNA in the S phase, so the checkpoint stops the cells from moving to this phase till it has all the necessary things to do it.

Jupiter's Great Red Spot is believed to be ____________.
a. a volcanic area
b. the effect of a mountain system on Jupiter's wind system
c. a zone of high ammonia concentration
d. a large rotating hurricane-like storm (cyclone)
e. none of these

Answers

It’s a huge typhoon-like storm of swirling gasses. A long-lived, oval cloud circulation similar to a hurricane on Earth.

The Great Red Spot, a permanent region of high pressure in Jupiter's atmosphere, is responsible for producing the largest anticyclonic storm in the Solar System. Thus, option D is correct.

What Jupiter's Great Red Spot rotating hurricane-like storm?

In Jupiter's atmosphere, there is a huge, rotating storm known as the Great Red Spot. It is similar to an Earthly hurricane, but considerably bigger.

The Great Red Spot on Jupiter is larger than Earth by more than two times! Within this storm, winds can gust as high as 270 miles per hour (ca. 435 km/h).

When astronomers first focused their telescopes on Jupiter in the 17th century, they discovered a striking reddish patch on the massive planet. More than 300 years later, the Great Red Spot is still visible in Jupiter's atmosphere. It is now understood to be a big storm that is rotating like a cyclone.

Therefore, Jupiter's Great Red Spot is believed to be (a large rotating hurricane-like storm (cyclone)).

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Select the correct answer from the choices provided in the underlined sections

A plant grown in low light will have (lighter / darker) flower color while a plant grown in bright light will have a (light / darker) flower color.

Answers

Answer:

darker and lighter

Explanation:

Hope it helps :)

A plant grown in low light will have darker flower color while a plant grown in bright light will have lighter flower color.

The plants which grow in high light intensities are called?

The plants which have the ability to survive in the high intensity of sunlight they are called heliophytes.  

Prosopis, Betula, Teak, etc are the examples of heliophytes.The plants which grow in low light intensities are called Sciophytes. Example includes Aegle, Nycanthes.

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Which of the following processes involves the endocrine system and digestive system working together?
A. Oxygen is carried to blood cells as food is digested in the stomach.
B. Hormones stimulate the pancreas to release enzymes needed to break down food.
C. The brain sends signals to the muscles to chew food.
D. When the hand touches hot food, it is quickly moved away

Answers

Answer:

Hormones stimulate the pancreas to release enzymes needed to break down food

How is the environmental problem caused by humans? Describe the specific human activity that causes this problem.


Your response should be about 2-4 sentences long, or it may be written as bullet points

Answers

Answer:

Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.

Explanation:

sana po makatulong

PLEASE ANSWERR

Which of the following is the independent variable for a controlled experiment
investigating how waste production affects a certain person's ecological
footprint?

A. Opinion the person has about environmental impact
B. Measurement of the amount of waste produced
C. Identification of the person
D. Calculation of resulting ecological footprint

Answers

Answer: Measurement of the amount of waste produced.

Explanation:

Measurement of the amount of waste produced is the independent variable for a controlled experiment in this case. Therefore, the correct statement is option B.

What is the independent variable?

The independent variable is the variable that can be changed in a controlled experiment. In this case, the researcher can manipulate the amount of waste produced followed by observation of its effect on the ecological footprint.

The researcher can manipulate the amount of waste by changing the factors such as the type of waste produced, recycling facilities available, etc. under controlled conditions.

Once the independent variable is manipulated, the researcher can observe its effect on the dependent variable. In this case, the ecological footprint of the individual is a dependent variable. The dependent variable is the variable that can be affected by the independent variable and is measurable.

Therefore, the measurement of the amount of waste produced is the independent variable for a controlled experiment.

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Put these items in order from largest to smallest, make sure to watch the video.

Answers

Protein, genes, chromosomes and DNA

The following picture is what part cell division?

Answers

Answer:

ANNYEONG HASEYO JONEON BANGTANSONYEONDAN HOGEON MAKNAE JEON JUNGKOOK IMNIDA

A radioactive material has a half-life of 30 days. You begin with 4 grams of radioactive material.


a. How much of the original is left unchanged after 90 days?


b. After 120 days?


Give explanation. Don't go.ogle.

Answers

Answer:

a. 0.5 grams b. 0.25

Explanation:

Just use the half-life formula(I linked it below)

a. 4(1/2)^90/30=1/2

b. 4(1/2)^120/30=1/4

A. 0.5 grams is left unchanged after 90 days.

B. 0.25 grams is left unchanged after 120 days.

What is Half life?

The half-life of a radioactive isotope is defined as the time it takes for half of the radioactive isotope to decay. It is stable in specific radioactive isotopes. It is unaffected by circumstances. It is also independent of the initial amount of that isotope.

It can be find out by this formula:-

[tex]N=N_o (1/2)^n\\\\[/tex]

where, N=  quantity of the substance remaining

[tex]N_o[/tex]= initial quantity of the substance

n= number of half lives

For above given example,

Given that radioactive element X has a half-life 30 days

Hence the number (n) of half-lives in 90 days

n=90/30

n=3

The amount N of radioactive element X left after n=3 half-lives with initial amount [tex]N_o[/tex]=4 gm

[tex]N=N_o (1/2)^n\\\\\\N= 4 (1/2)^3\\N= 4(1/8)\\N= 0.5 gms\\\\\\[/tex]

For 120 days, n=120/30

so, n= 4

Then,

[tex]N=4(1/2)^4\\N=4(1/16)\\N=0.25 gms[/tex]

Thus, A. 0.5 grams is left unchanged after 90 days.

B. 0.25 grams is left unchanged after 120 days.

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How does heat affect the thermal energy of an object that is colder than the air that surrounds it?

Answers

Answer:

Heat decrease the thermal energy of an object as energy moves to the air. Heat causes the thermal energy of the object to increase as energy moves from warmer air to the colder object

I dont know what is the answer sorry!


The real length of one villus is 0.8 mm
Calculate the image length if the villus is viewed at a magnification of 20
Use the equation:
size of image
magnification =
size of real object
[3 marks]

Answers

Answer: 16 mm

Explanation:

If I understood the given equation correctly, it could be rewritten as:

size of image = size of real object * magnification

Plug in the given values, and we get

size of image = 0.8 * 20 = 16 (mm)

What experiment is left overnight what would be the observation fresh potato in sugar solution and water

Answers

The potato would expand or it’s mass will increase bc there is more solute in the potato. The potato is placed into a hypotonic solution, thus the water will move into the potato.

Photosynthesis takes place in the _______________ and releases __________________.
A. mitochondria, oxygen
B. chloroplast, oxygen
C. mitochondria, carbon dioxide
D. chloroplast, carbon dioxide

Answers

Answer:

B. chloroplast, oxygen

Explanation:

This is because plants take in the carbon, water, air,and it transforms the water into oxygen and carbon into glucose. So it absorbs light, and the chloroplasts are special structures that are responsible for that absorption of light, They are green, because of chlorophyll, which gives the green pigment to leafs

photosynthesis takes place inside them, so they can absorb light to start the process.

How does a planet's distance from the Sun affect its surface temperature and the length of its orbit (year)?

PLS IS FOR TODAYY

HELP MEE PLSS

Answers

Answer:  In general, the surface temperatures decreases with increasing distance from the sun. Venus is an exception because its dense atmosphere acts as a greenhouse and heats the surface to above the melting point of lead, about 880 degrees Fahrenheit (471 degrees Celsius)

Explanation:

I Hope This Helps You! Have a Great day! ^v^

Which of the following was from the Flemish timeframe (era)?

O Created arrangements using a single flower
O striped/flame colored tulips were popular
O used daffodils as a form of currency
O Daffodils were traded similar to current day "stocks"

Answers

Answer:

Striped/flame colored tulips were popular

Explanation:

I took the test and said I got it right plus in this typical time colored tulips were used for many things besides them being in ponds

How does eutrophication affect an aquatic ecosystem

Answers

Answer:

Eutrophication is an enrichment of water by nutrient salts that causes structural changes to the ecosystem such as: increased production of algae and aquatic plants, depletion of fish species, general deterioration of water quality and other effects that reduce and preclude use”.

Explanation:

Answer:

It prevents sunlight from reaching aquatic life below the water’s surface.

Explanation:

Got it right on PLATO

Cual son las consecuencias y el tratamiento del crecimiento lento en niños? Plis me pueden decir con explicación

Answers

Answer:

Efecto adverso sobre la salud.

Explicación:

El crecimiento lento de los niños afecta la salud de los niños, haciéndolos más susceptibles a enfermedades e infecciones, pero también afecta su desarrollo mental y físico. Las inyecciones de hormona del crecimiento y los medicamentos de reemplazo de la hormona tiroidea son tratamientos que se usan para tratar el crecimiento lento en los niños. La deficiencia de la hormona del crecimiento se puede tratar mediante inyecciones de hormona del crecimiento. Los medicamentos de reemplazo de la hormona tiroidea se utilizan para compensar la hipoactividad de la glándula tiroides del niño.

How did the insertion of a nucleotide in a DNA sequence result in a phenotypic change in an organism

Answers

Answer:

if the nucleotide insertion occurs within the coding region of a gene (frameshift mutation), then it will change the open reading frame (ORF) of the resulting protein and thus also will alter the phenotype of the individual  

Explanation:

A mutation is any change in the DNA sequence of the genome of a cell/organism. A point mutation is a genetic mutation where a single nucleotide is inserted, deleted or changed from the original DNA sequence. The insertion of a single nucleotide in the coding region of a gene is called frameshift mutation since this nucleotide base shifts the way the DNA sequence is read. A frameshift mutation changes the meaning of the codons that follow the inserted nucleotide base and thereby protein function is generally lost, thereby also affecting the resulting phenotype associated with this protein.

lol yea i need help again

Answers

It has two strands

Hope this helped :))

Which of the following is a true statement about reproduction?
A. Sexual reproduction requires two individuals from the same species; two males, two females, or a male and a female. B. Asexual reproduction requires two individuals from the same species—two males, two females, or a male and a female--to produce offspring. C. Sexual reproduction requires a male and a female gamete. D. Asexual reproduction requires a male and a female from the same species.

Answers

A . sexual reproduction requires two individuals from the same species, a Male and a female

but sexual reproduction refers to the union of a Male and a female

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