What is a zygote? help plz also heres a meme

What evidence did mendel find that supported his law of independent assortment? a. dominant traits are expressed when there is a dominant allele. b. traits do not affect the inheritance of other traits. c. some traits have three or four different alleles. d. plants and animals can both reproduce sexually.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Why do mountaineers become breathless as they reach high altitudes