B)
Both occur in only one direction.
Answer: Option C
Explanation:
When two genetically similar species can breed among each other in order to produce a fertile offspring then it is known as members of same species.
The offspring that is produced must be fertile in order to extend the members in the same species.
Two organism can breed because they are genetically similar and the similarity allows the organism produces a fertile offspring.
It's c the answer is the developing embryo does not bry out.
