Answer:
D
Explanation:
Co-dominance is when both alleles combine to form an intermediate phenotype. It's like crossing a red and white flower and getting a pink flower.
Hemihydrate is the answer because it is a crucial mineral in the construction of dry wall.
The blue Jay's situation because the humans are cutting down the trees therefore it's a human-included environmental change affecting the blue Jay's population
A scientific model is used to make a part of the world easier it could be use to explain something and make it understandable to learn. It is mainly use to provide a reference for other people by showing them a example and a experiment on how the that subject works. The main purpose of scientific models is "to explain something that cannot be experienced directly."
Hope this helps!