Draw the line of reflection that reflects quadrilateral A B C D ABCDA, B, C, D onto quadrilateral A ′ B ′ C ′ D ′ A ′ B ′ C ′ D ′ A, prime, B, prime, C, prime, D, prime.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.

Which of the following is not associated with invasive species?