Which statement best describes the use of a control sample that is known to be from bighead carp in edna surveillance?

a. as a positive control to compare with the markers of known fragment sizes
b. as a negative control to compare with the markers of known fragment sizes
c. as a negative control to show if there are bighead carp present in the area
d. as a positive control to show if there are bighead carp present in the area

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

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.

What are 3 reasons that natural selection occurs