Which group is the ancestor of all modern land vertebrates?
Answer: Stem reptiles
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In which of the following animals would perfusion be LEAST efficient during gas exchange?
a. a bird b. a frog c. a fish d. a flatworm e. a human
Scientists began to question the perfection of
the Chain of Being because of a. the discovery of new organisms in new parts of the world. b. the presence of body parts with no apparent function in some organisms. c. the existence of fossil forms. d. similarities in the structures found in different forms of life. e. all of these.
Aneuploidies describe:a
a phenomenon that only occurs in plants. b. a condition in which an extra chromosome is present or one is absent. c. a defect that is always fatal in humans. d. an uncommon condition in humans. e. mutations that almost always have a beneficial effect on an individual.
_______is usually detrimental in eukaryotic species because, for some genes, the over- or under-expression of these genes may interfere with the proper functioning of cells.
Fill in the blank(s) with the appropriate word(s).