The fossil record shows that the jawed fishes called ____, which diversified in the Devonian and Carboniferous and jaws with sharp cutting edges



a. acanthodians
b. conodonts
c. osteolepiforms
d. placoderms
e. ostracoderms


ANSWER: d

Biology & Microbiology

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There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome

by excessive mutations. Since the rotifers develop from eggs, but asexually, what can you predict? A) The eggs and the zygotes are all haploid. B) The animals are all hermaphrodites. C) While asexual, both males and females are found in nature. D) All males can produce eggs. E) No fertile males can be found.

Biology & Microbiology

Eukaryotes usually have more than one chromosome for the storage of genetic information.

Answer the following statement true (T) or false (F)

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A solution with a pH of 8 has how many times fewer

hydrogen ions than a solution with a pH of 6? a. 2 b. 4 c. 10 d. 100 e. 1,000

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In the mammalian digestive system, what is the primary site of nutrient absorption?

A. large intestine B. pharynx C. stomach D. pancreas E. small intestine

Biology & Microbiology