Answer:
A
Explanation:
Cells in the leaves of plants contain specialized structures called chloroplasts.
Which two factors provide the genetic basis for variation within a species?
A. competition and protein synthesis
B.constant gene frequency and reproductive isolation.
C.mutations and sexual reproduction.
D.asexual reproduction and geographic isolation.
Answer:
Hi, there the answer is C.mutation and sexual reproduction
Explanation:
Answer:
c
Explanation:
it is the most logic answer
1.Which of the following stars closest to the Earth?
A. Alnilam B. Sirius C. Sun D. Vega
2.Why do stars have colors? It is because of the ______________.
A. different locations
B. varied temperature
C. presence of oxygen
D. presence of carbon dioxide
3.Based on apparent magnitude, which of the following stars is the brightest?
A. Alpha Centauri C. Rigel
B. Betelgeuse D. Sirius
4. The following are the ways which the stars differ from each other EXCEPT
A. Brightness B. Color C. Shape D. Size
5.Stars can be found in large groups throughout the universe. What are these groups
called?
A. Asteroids B. Comets C. Constellations D. Solar system
6.How do stars appear to move in the night sky? It moves from ______________.
A. East to West C. West to East
B. North to South D. South to North
7.Why do stars appear in the sky? It is because the __________________.
A. night sky is rotating
B. universe is expanding
C. new galaxies are formed
D. earth is rotating on its axis
8. If you are located at the North Pole, where will you see the Polaris?
A. Overhead
B. Just above the horizon
C. Around 450
from the horizon
D. Polaris will not be seen in the North Pole
Explanation:
1_C
2_A
3_D
4_B
5_C
6_A
7_C
8_C
1. The closest star to earth is actually Sun at 93,000,000 miles (150,000,000 km).
2. Stars are different colors such as blue, white, yellow, orange, and red. The color indicates the star's temperature in its photosphere, the layer where the star emits most of its visible light. Thus the correct option is B.
What is star?
A star is a luminous ball of gas containing hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements.
3. Sirius star also known as the Dog Star or Sirius A, is the brightest star in Earth's night sky. Thus the correct option is D.
4. Stars vary in their mass, size, temperature, color, luminosity, and age. They differ in their distance from earth, and some orbit one or more other stars. The stars differ from each other brightness.
5. Small groups of stars are called star systems, and somewhat larger groups are called star clusters. There are even larger groups of stars, called galaxies. Thus the correct option is D.
Our solar system is in the Milky Way Galaxy, which is just one galaxy in the universe. The patterns of stars seen in the sky are usually called constellations, although more accurately, a group of stars that forms a pattern in the sky is called an asterism.
6. Stars rising in the East, passing overhead, and setting in the West.
Thus the correct option is A.
7. This motion is due to the Earth's rotation. As the spin of the Earth carries us eastward at almost one thousand miles per hour, we see stars rising in the East, passing overhead, and setting in the West. The Sun, Moon, and planets appear to move across the sky much like the stars.
Thus the correct option is D.
8. If you go as far north as the North Pole, you'll see Polaris directly overhead. As you travel south, Polaris drops closer to the northern horizon. If you get as far as the equator, Polaris sinks to the horizon.
For more information regarding stars, visit:
https://brainly.com/question/21379923
#SPJ2
what is method of chromatography
method of chromatography is seperating the modules of a solution according to one or more of its chemical proporties.
Which one of these is the most accurate in determining the absolute age of two rocks?
A. Vertical position
B. the presence of unconformities
C. Radioactive dating of each layer
D. Comparing fossils in the layers
Answer:
radioactive dating of each layer would be the right one
The Gulf of Mexico is to oil as-
Answer:
The gulf of mexico is to oil as coal is to fires
Explanation:
The gulf of mexico is to oil as coal is to fires.
What are the features of gulf of mexico?The Gulf of Mexico is an ocean basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is responsible for 54% of oil production in the U.S., and 47% of natural gas production.
The Gulf of Mexico is an ocean basin or bay of the Atlantic Ocean. It is a marginal sea of North America. The United States of America, Mexico, and Cuba are the countries around it.
The Gulf of Mexico is located below the southeastern portion of the United States. It borders the coasts of Texas, Louisiana, Mississippi, Alabama and Florida as well as the island of Cuba and parts of Mexico.
Learn more about gulf of mexico:
https://brainly.com/question/29799354
#SPJ2
Which of the following causes air masses to move around the globe and
generates wind?
Unequal heating of Earth's surface
Equal heating of Earth's
surface
Deep ocean currents
Wind patterns from the Southern Hemisphere
Answer:
Unequal heating of Earth's surface
Explanation:
base on my research
what are the answers to these
Answer:
24
Explanation:
it works:)
double checking
[extra characters]
explain the concept of gaseous exchange in humans
Which of these is NOT a similarity that whales share with land animals?
1. Some have legs to walk
2.Blowhole like a
nose
3.Feed their baby milk
Whales being aquatic, is considered as mammal. They have blowhole that resembles to nose of mammals and they also feed their babies like mammals.
What is the characteristics of a mammal?Mammals are warm blooded animals that gives birth to young ones. They have advanced reproduction and prenatal care for their babies.
The mammals have following characteristics:
Presence of hair or fur.They have sweat glands.These have mammary gland that produces milk.These have four chambered heart.These have more complex brain.As whale have mammary glands, they gives birth to young ones and feed milk to their babies, so, these are included under mammals.
Thus, the correct option is 1.
For more details regarding mammals, visit:
https://brainly.com/question/15326492
what are secondary compounds and what is their function? list two examples of secondary compounds.
Answer: list two examples of secondary compounds.
Secondary Metabolites in Plants
Class Example Compounds Some Effects and Uses
Flavonoids anthocyanin, catechin flower, leaf color; inhibit enzymes, anti- and pro-oxidants, estrogenic
Tannins gallotannin, condensed tannin bind to proteins, enzymes, block digestion, antioxidants
Lignin lignin structure, toughness, fiber
Explanation:
Hope it helps you if not sorry
What does NOT happen during interphase
What kind of weak bonds holds the two strands of DNA together?
A. Nitrogen bonds
B. Phosphate bonds
C. Peptide bonds
D. Hydrogen bonds
D. Hydrogen bonds............
Answer:
D. Hydrogen bonds
Explanation:
Hydrogen bonds holds the two strands of DNA together.
What is the name and function of the structure indicated by A?
What strand is "read" in order to get the amino acid sequence?
Answer:
In translation, the cell uses an mRNA strand that it has just transcribed from its genetic code as a template to assemble proteins. The cell has just transcribed this mRNA stand from its DNA, and now it translates the mRNA's nucleotide sequence into a chain of amino acids.
Explanation:
hope this helps
have a great day/night :)
How have humans changed the global nitrogen cycle?
A. They have greatly decreased the amount of fixed nitrogen.
B. They have raised the speed at which nitrogen travels through the
cycle.
C. They have lowered the speed at which nitrogen travels through the
cycle.
D. They have greatly increased the amount of fixed nitrogen.
Answer:
D
Explanation:
Humans activities, such as making fertilizers and burning fossil fuels, have significantly altered the amount of fixed nitrogen in the Earth's ecosystems.
Someone plzzz help me is due in 20 min !! thank youuu
Answer:
A. The energy released from ATP based on the model is from the hydrolysis of the terminal phosphate group in ATP.
B. ATP in cells serves as a source of energy for cellular work/activity.
Explanation:
A. The energy released from ATP based on the model is from the hydrolysis of the terminal phosphate group in ATP. This hydrolysis of the terminal phosphate group of ATP proceeds with the release of a large amount of energy. This energy is called standard free energy of hydrolysis of ATP and is relatively large under standard conditions; about -30.5 kJ/mol.
The removal of the terminal phosphate group is able to release this amount of energy because it relieves some of the electrostatic repulsion of the negative charges the three phosphate groups in ATP. Also resonance stabilization of the released phosphate group contributes to the energy released.
B. ATP in cells serves as a source of energy for cellular work/activity. The hydrolysis of the high-energy phosphate bonds as well as the coupling of the energy released to energy-requiring reactions in the cell is the mechanism used by the cells to utilize the energy released by ATP. This couplingis usually in the form of transfer of a phosphoryl group, pyrophosphoryl group, or adenylyl group from ATP to a substrate or enzyme which then uses the energy released to transform substrates to products.
In chart 2, the lines labeled Age 65+ and Age < 5 show a distinct trend. If this trend continues, name one way it will affect human society negatively.
Answer: in chart 2, the age 65+ line is increasing and the age <5 line is decreasing. These trends indicate that the number of old people is increasing while the number of young people is decreasing.this can strain resources, because there may not be enough young people to take care of the old when they are sick.
Explanation:
Answer:
In chart 2, the Age 65+ line is increasing and the Age < 5 line is decreasing. These trends indicate that the number of old people is increasing while the number of young people is decreasing. This can strain resources, because there may not be enough young people to take care of the old when they are sick.
Explanation:PLATO
The hydrogen between the two strand of DNA are broken by the enzyme DNA helicase
1. If the secondary consumer has 365 kcals, how many kcals would the producer level have? ____ kcals
2. Which tropic level would have the most available energy (kcal) ?
Answer:
1. 36500 kcals
2. Producers
Explanation:
As organisms in one trophic level feeds on another organism in another trophic level, one must bear in mind that only 10% of available energy at each trophic level is transferred.
According to this question, the secondary consumer trophic level has 365 kcals of energy. Since there are primary consumer and producer trophic levels before this, it means that 100 times of energy was previously available at the producer level. Hence, 365 kcal × 100 = 36500 kcal of energy is available at producer level.
2. The producer level has the most available energy (kcal) among the trophic levels because they get it directly from the sun and are the first participants of the energy transfer.
On the diagram - label ALL the nitrogen bases not
already labeled (A, T, C or G)
LITTL
can someone help?
Explanation:
I hope the diagram will help remember A always pairs with T and C always pairs with G. u can also remember as Apple Tree and Car Garage. :)
Help please!!! In_____ selection, the environment determines which individuals pass on their traits, while in_____ selection, a farmer or breeder determines which individuals pass on their traits.
A: natural,Lamarckian
B:artificial, natural
C: artificial, independent
D: natural, artificial
Answer:
D
Explanation:
Natural selection and artificial selection
Oxygen has an atomic number of 8. The n=1 energy level has two electrons, and the n = 2 energy level has six electrons. Oxygen's valence is _______.
● +2
● -2
● +1
● -1
Answer:
Oxygen's valence is +2
the answer is +2
I hope this helps
Answer:
● -2
Explanation:
Oxygen needs to gain 2 more electrons to have 8 electrons in outer most shell (octet rule). Gaining electrons makes you negative thus, oxygen gains 2 electrons and has valence of -2.
Which of the following is formed when a
cancerous cell replicates uncontrollably?
A. a blood clot
B. a tumor
C. tuberculosis
D. organ death
Answer:
a tumor
Explanation:
Answer:
B: a tumor is formed
Explanation:
a tumor is formed
Write any three problems with the measurement of quantities that the SI unit system has solved.
Explanation:
1. they are convenient to use 2. it helps the international tade 3. it eases the exchange of material
Cell Membrane Diseases Cell membrane diseases are life -threatening disorders that are in nature , and they usually work against proteins in our body that are key to ion channels and various receptors within the membrane . These diseases work by either disrupting the normal functions of the or by simply affecting the cell membrane . Many of these disorders contain other components as well. Some disorders involving trouble with the cell membrane
1) Cystic fibrosis
2) Alzheimer's disease
3) Duchene Muscular Dystrophy
4) Hyaline Membrane disease
Answer
cell kytosis
Explanation
why people living in high altitude have level of RBC?
Answer:
Scientists have long known that the body adjusts to the oxygen-deprived conditions of high altitudes. ... The traditional explanation has been that low-oxygen conditions cause the body to build new red blood cells, making it easier to supply oxygen to muscles and vital organs.
Which of the following accurately describes ionic bonds?
O A. Atoms share one or more protons.
O B. Atoms transfer one or more electrons.
O C. Atoms share one or more electrons.
O D. Atoms transfer one or more protons.
Answer:
C. Atoms share one or more electrons.
Explanation:
Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms.
When analyzing DNA, what percentage of the human genome do tandem repeats represent?
5 percent
25 percent
30 percent
60 percent
Answer:
60 percent i think
Explanation:
hope this helps
The percentage of which the human genome that tandem repeats signal while assessing DNA would be:
D). 60 percent
The process of tandem repeats takes place in DNA in the situation of nucleotides' repetition.They are widely used and quite significant in the forensic assessment of Deoxyrhybo Nucleic Acid. In the case of assessment of DNA, 60% of the human genome is represented in the process of the tandem repeat.Thus, option D is the correct answer.
Learn more about "DNA" here
brainly.com/question/264225
Protective gear is an important part of the job, yet employees often have to be reminded to wear it. Why do you think people are often reluctant to wear the required gear? How could their employers address these concerns?
Answer:
It's important to wear gear at all costs.
Explanation:
If you do not wear protective gear during jobs, bad things can happen. You can have dangerous chemicals in your skin, germs spread, etc. It depends on the job, really.