Which description characterizes a stable ecosystem? A. One type of organism
B. Two types of organism
C. At least one type of Animal
D. A one type of organism

Your answer is most probably B).

A), C), and D) are all saying the same thing.

ocean expansion, global warming is melting icebergs and causing water levels to rise.

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)