What is this question i have 15 mins

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because