It would be B. Less force is needed to move up the ramp
Pretty sure the answer is oxygen, as it is produced in photosynthesis and consumed in respiration.
I think that the answer is global warming
They are called sacromeres.
The right answer is Nutrients and water.
All unicellular organisms such as bacteria and fungi need water, a source of energy, a source of carbon, a source of nitrogen and mineral elements. These basic needs are sufficient to allow the nutrition of bacteria qualified as prototrophs. Some bacteria called auxotrophs require, in addition to basic needs, the presence of growth factors.
