H-H
O//O
For oxygen, draw the lines horizontally
There is going to be a 25% chance of it being heterozygous unless both parents are heterozygous then if so you do happen to have to heterozygous parents it will be 100% heterozygous.
Answer:D
Explanation:
This isn’t B, because it’s only one species. It isn’t C, because it is one population, and A doesn’t make sense due to how they are of course organisms. D is your best bet.
A term for softening of the brain is tephromalacia.