If a trait made an organism less likely to survive and reproduce what would happen to the allele for that trait?

Nitrogen-14 and nitrogen-15 are isotopes of the same element. how do these two isotopes differ? a. they have different numbers of nuclei. b. they have different numbers of protons. c. they have different numbers of neutrons. d. they have different numbers of electrons.

The somatic cell of a cat contains 38 chromosomes (2n = 38). how many chromosomes and how many dna molecules would the secondary spermatocyte of this cat have?

Is a glacier nothing more than a huge mineral flowing downhill? be sure to defend your answer with facts.