Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
Prophase 1, where crossing over occurs and DNA is already replicated
Answer:
B. The carbon cycle
Explanation:
In the carbon cycle, carbon in the atmosphere is absorbed into plants, where the plants use photosynthesis to convert that carbon into oxygen and energy for themselves. Neither of the other cycles involves a plant taking in a gas directly from the atmosphere.
Hopefully this was helpful! :)
A because it pertains the the ecosystem