Which of these would most likely contribute to the extinction of a species?
a. an increase in its genetic variability
b. a decrease in the number of its competitors
c. the extinction of species at higher trophic levels
d. the extinction of species at lower trophic levels

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna. b) they study alleles that contain genes, which are chromosomes. c) they study chromosomes that contain genes, which are dna segments.

Which of the following organisms are capable of self-fertilization? a. plants b. tigers c. humans

Which does not describe a physical change happening to water? water evaporating in the sun water reacting with nitrogen gas water freezing and being broken apart with a knife water heating up on a stove