What phrase from the selection helps you understand the meaning of “composes”?

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)

carbon atoms, hydrogen, oxygen, and nitrogen.

the tricuspid valve is present between right atrium and right ventricle

im not intirely sure but i think the anwser is d relative humidity