B) The phosphorus cycle I think
Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance.
Explanation:
El Nino occur irregularly approximately every two to seven years. Warm water generally appears off the coast of South America close to Christmas, and reaches its peak warmth in the eastern Pacific during the late fall of the following year.
The correct answer would be A. yes, but it is only produced at night when plants can no longer carry on photosynthesis.
Explanation:
This is because when the sun rises Photosynthesis starts which carbon dioxide is taken in and oxygen is given out.