Since all organisms contain DNA (or RNA), how can DNA be used as a trait in studying phylogeny?
What will be an ideal response?
Responses should explain that the presence of DNA is not a distinguishing trait, but rather the sequence of nucleotides is used to differentiate between related species. The similarities in amino acid or nucleotide sequences can be used to group organisms according to their evolutionary histories.
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Which of these ecosystems has the lowest productivity?
A. tropical forest B. temperate forest C. savanna D. open ocean E. lakes
What percent of plasma is water?
a. 10 percent b. 27 percent c. 55 percent d. 77 percent e. 92 percent
There is NO convincing fossil evidence for which of
the following? a. evolution b. extinction c. change d. catastrophism e. uniformitarianism
Shortly after fertilization, successive cell divisions convert the zygote into a multicellular embryo
during a process known as a. meiosis. b. parthenogenesis. c. embryonic induction. d. cleavage. e. invagination.