Please help! Cladograms represent hypotheses of relatedness based on evidence. When cladograms are constructed from molecular evidence, scientists must examine genes to determine placement. What key factor should scientists look for when determining relatedness between species using this type of evidence? Biochemical pathways
Mutations to homologous genes
The pattern of embryological development
Morphology

The body is protected against harmful flu viruses by

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

The fluid mosaic model of the membrane proposed that membranes