Although birds, fish, mammals, reptiles, and amphibians are different, evidence of their evolutionary links is provided
by ____.
a. chemical analysis
b. comparison of adult body forms
c. comparison of ways in which their embryos develop
d. time of gestation
e. comparing life expectancies
ANSWER: c
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The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups—Lophotrochozoa and Ecdysozoa. What does this finding suggest?
A) These two subgroups have a common ancestor that was a deuterostome. B) The protostomes are a polyphyletic group. C) Division of these two groups occurred after the protostome developmental sequence appeared. D) The lophotrochozoans are monophyletic.
Answer the following statements true (T) or false (F)
1. The chance that a mutation will occur is independent of whether a new phenotype will benefit a population. 2. The hypothesis that birds are closely related to small dinosaurs called theropods began with the discovery of the fossilized skeleton of Archeopteryx. 3. Dinosaurs appeared, became diverse, and eventually became extinct during the Paleozoic era. 4. Earth's history spans about 4.5 billion years. 5. The abundant presence of ammonite fossils, corals, sponges, and crinoids in a large area indicates that the area was once part of an ocean.
Small pieces of DNA can be amplified by a process known as polymerase chain reaction
Indicate whether the statement is true or false
Place the phases of the ovarian cycle in the correct sequence with the first phase to occur at the top of the list.