600 million years ago
Macroscopic multi-cellular life had been dated to around 600 million years ago, but new fossils suggest that centimeters-long multi-cellular organisms existed as early as 1.56 billion years ago
Answer:
proterozoic period
Explanation:
300 million years ago
The presence or absence of freckles is determined by one gene. The allele for freckles (F) is dominant and the allele for the absence of freckles (f) is recessive. A couple has several children. All of the children have freckles because their parents' genotypes can only produce children with freckles. Which of these are most likely the genotypes of the two parents?
Group of answer choices
A: ff and ff
B: Ff and ff
C: FF and ff
D: Ff and Ff
The root word “lun” or lune refers to the ____________
Answer:
Lun or Lunar are references for the moon.
1. What are too small to be seen but make up everything?
Answer:
Matter is made up of small particles that are too small to be seen, even with a powerful microscope.
Answer:
atoms and molecules
Explanation:
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Which type of weathering occurs most frequently at high elevations, and can bring mountains down to sea level over time?
If you want to move a 12kg object at 2m/s, how much force must be applied?
Answer:
F = 24 N
Explanation:
im not 100% sure if this is correct but tried
Describe how radiocarbon dating method is used to find the absolute age of a fossil?
Answer:
Radiocarbon dating involves finding the age of an ancient fossil by measuring its carbon-14 content. Carbon-14 (radiocarbon), is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.
If carbon dioxide was removed from a plant's environment, what would you expect to
happen to the plant's production of sugars?
O fewer sugars will be produced
more sugars will be produced
O carbon dioxide does not affect the production of sugars in plants
o the same number of sugars will be produced but without the carbon dioxide
Answer: Fewer sugars will be made because plants use carbon dioxide in photosynthesis.
Hope this helps
Plants are autotrophs, which prepare their food in the presence of sunlight, water, and carbon dioxide to yield sugar and oxygen.
The carbon dioxide is removed from the plant's environment, then less sugar will be produced.
Photosynthesis is a metabolic process in which plants prepare food in the presence of sunlight, carbon dioxide, and water. The products of photosynthesis are oxygen and sugar molecules.
The carbon dioxide if removed or reduced from the plant's environment, then the plants will be unable to perform photosynthesis properly, and in the limited resources, the products formed will be reduced.
Thus, the correct answer is Option A.
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what are nodes and inter nodes
Answer:
Nodes are the regions on the stem from which leaves develop, while internodes are the regions between two nodes.
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please help me :( did anyone took the isat ( International student admission test) ??
Which of the following is NOT one of the four systems into which scientists divide earth
A.biosphere
B.hemisphere
C.geosphere
D.hydrosphere
Answer:
Should be D
Explanation:
The one that is not one of the four systems into which scientists divide earth is hemisphere. The correct option is B.
What are the spheres of Earth?
The four main subsystems of the Earth are the land, the water, the living beings, and the air. The term "spheres" refers to these four subsystems.
They are the "geosphere" (land), "hydrosphere" (water), "biosphere" (life) and "atmosphere," specifically (air).
The biosphere, geosphere, hydrosphere, and atmosphere are the spheres. Together, they are in charge of establishing and preserving the Earth's climate, geological processes, and life.
The main significance of the hydrosphere is that it supports a variety of life forms, is crucial to ecosystems, and regulates the atmosphere. All of the water on the Earth's surface is covered by the hydrosphere.
Thus, the correct option is B.
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Is RNA Is a double helix
How does mitochondria help the cell get the material it needs
Answer:
Known as the “powerhouses of the cell,” mitochondria produce the energy necessary for the cell's survival and functioning. Through a series of chemical reactions, mitochondria break down glucose into an energy molecule known as adenosine triphosphate (ATP), which is used to fuel various other cellular processes.
How do calcium ions help amplify the signal?
HELP PLEASE!!!
Answer:
Calcium signaling is the use of calcium ions (Ca2+) to communicate and drive intracellular processes often as a step in signal transduction. Ca2+ is important for cellular signalling, for once it enters the cytosol of the cytoplasm it exerts allosteric regulatory effects on many enzymes and proteins. Ca2+ can act in signal transduction resulting from activation of ion channels or as a second messenger caused by indirect signal transduction pathways such as G protein-coupled receptors.
Explanation:
Wikipedia
Do ocean currents affect aquatic life? What do you think and why?
How does the change in atmospheric conditions affect aquatic life? Explain your response.
The ocean life would die off because less salinity in the water and if the currents decrease in strength the nutrients they carry would not make to the life in the oceans and ocean life would die.
can someone please help me .. will mark brainliest !
Answer:
I believe that the answer would be: Evolution of the fruit fly over time (A)
Explanation:
As we can see, the fruit fly shown is the only fruit fly we are observing. Therefore, we need to determine how it has different cells among other cells. This is where evolution would come into the picture. The reason this fruit fly has different cell structures and functions is because, over time, their bodies and makeup have changed, leaving behind these "older" cells that are now dominated by the newer ones. So, evolution is the reason why the fruit fly has different cell structures and functions.
Just like how us humans have wisdom teeth in our mouths that are not necessary because our mouths have evolved to be smaller; there isn't enough room for them to grow, in some cases.
I hope this helps! :)) Have a good night!
Why does dna need to replication short answer please
DNA replication needs to occur because existing cells divide to produce new cells.Each cell needs a full instruction manual to operate properly. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions!
HOPE IT HELPS YOU OUT PLEASE MARK IT AS BRAINLIEST AND FOLLOW ME PROMISE YOU TO FOLLOW BACK ON BRAINLY.INWhich statements describe oceanic crust? Select the two correct answers.
A. It’s age ranges from very young to more than 4 billion years old.
B. It is formed at zones of volcanic activity on the ocean floor.
C. It is made of all types of rocks.
D. It is between 25 and 70 km thick.
E. It contains silicate minerals high in iron and magnesium.
Answer:
The correct answers are options B. "It is formed at zones of volcanic activity on the ocean floor. ", C. "It is made of all types of rocks" and E. "It contains silicate minerals high in iron and magnesium."
Explanation:
In Geology, the continental crust is defined as the layer of the Earth that allowed the formation of the continents. This layer is made of all types of rocks, including igneous, metamorphic, and sedimentary rocks. This layer is also considered silica-rich, or felsic, because of its high content of silicate minerals. Regarding the thickness of continental crust, it is between 25 to 70 km thick. This is considerable thick considering that oceanic crust which barely reaches 10 km thick.
need rn!!!!!
What macromolecules make up the cell membrane? Based on the information you have from the diagram. (check all that apply)
- polysaccharides
- proteins
- lipids
- nucleic acids
PLSSS HELP ME PLSSS I WILL MARK U!!!!
Direction: Watch the video and answer the questions below
Answer:
Where is the video and what are the questions??
Explanation:
Please help me if you want!
Answer:
Your answer is C
How is radioactive decay related to radiometric dating
Answer:
Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks.
Explanation: It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
The Krebs cycle forms many products. Which option lists the correct products of the Krebs cycle after 1 molecule of glucose goes through it?
net 2 NAD+, 2 ATP, 4 CO2, 2 FADH
net 1 NADH, 1 ATP, 2 CO2, 1 FADH2
net 4 NADH, 4 ATP, 8 CO2, 4 FADH2
net 2 NADH, 2 ATP, 4 CO2, 2 FADH2
Answer:
Net 2 NADH, 2 ATP , 4 CO2, 2 FADH2
Explanation:
The correct products of the Krebs cycle after 1 molecule of glucose is ( option 4 ) ; Net 2 NADH, 2 ATP , 4 CO2, 2 FADH2
The Krebs cycle is a cycle/series of chemical reactions utilized by aerobic organisms in the generation of energy that is stored in phosphate bonds (ATP) through oxidizing acetate ( gotten from carbohydrates, fats and protein) into [tex]CO_{2}[/tex].
Hence when 1 molecule of glucose through the Krebs cycle the correct products will be Net 2 NADH, 2 ATP , 4 CO2, 2 FADH2
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The reactants for photosynthesis are carbon dioxide, water and sunlight (light energy).
true or false
examples of bacteriophage
Examples of bacteriophages are: 1) Temperate phages (mu and lambda) 2) Filamentous and spherical phages , both having ssDNA (single stranded DNA)
A chemical bond formed when two atoms transfer electrons is called
Answer:
covalent
Explanation:
what does ordered internal structure mean
Answer:
Ordered internal structure" means that the atoms in a mineral are arranged in a systematic and repeating pattern.
Explanation: they arranged and repeating pattern go see for urself its right and i need help but its ok cause i dont know what grade are u but go check im typing alot..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
the atoms in a mineral are arranged in a systematic and repeating pattern.
glucose molecules moving through protein channels is an example of what type of transport
A- Facilitated diffusion
B- Active transport
C- Passive transport
D- Osomosis
Answer:
B-active transport
Hope it will help
Thank you
what are the proteins used in active transprot called
Essential nutrients move through a cell membrane by both passive transport and active transport. Which of the following correctly describes the transport of materials across a cell membrane?
a) Active transport requires chemical energy to move nutrients from areas of low concentration to areas of high concentration.
b) Passive transport requires chemical energy to move nutrients from areas of low concentration to areas of high concentration.
c) Active transport moves nutrients from areas of high concentration to areas of low concentration without the use of chemical energy.
d) Passive transport moves nutrients from areas of low concentration to areas of high concentration without the use of chemical energy.
Answer:
I think it would be d.
Explanation:
all the facts and observations gathered in an experiment are called A.conclusions B.Data C.theories D.hyposthesis
Answer:
data
Explanation:
All the facts and observations gathered in an experiment are called data. Therefore, option B is correct.
What is an experiment?An experiment is a technique used to confirm or deny a hypothesis, as well as assess the likelihood or effectiveness of something that has never been tried before. Experiments show what happens when a specific factor is modified, which sheds light on cause-and-effect relationships.
The three primary categories of scientific experiments are quasi-experimental, observational, and experimental (non-experimental). The most rigorous type of scientific investigation is experimental, often known as randomized control. The most control is present, as the name would imply.
Data are the facts and the observations gathered in an experiment. Therefore, option B is correct.
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