Answer: B
Explanation:
Each produce food necessary for each organisms.
C. They are members of the same species but different genera.
A. The allele frequency of a population changes due to a bottleneck.
This is because genetic drift happens because of chances events such as founder effect of bottleneck effect
Answer:
Blood is stored within blood vessels in a closed circulatory system, which circulates unidirectionally (in one direction) from the heart around the systemic circulatory route until returning to the heart.
Explanation: