What do echinoderms and chordates have in common? 

A. endoskeletons
B. dorsal nerve cords
C. protostome development
D. ecdysis


A. endoskeletons

Biology & Microbiology

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Which type of animal would you dissect to locate a nephridium?

A) Reptile B) Bird C) Insect D) Earthworm E) Flatworm

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Homo sapiens first appeared during the

A. Tertiary period. B. Cretaceous period. C. Mesozoic era. D. Quaternary period. E. Permian period.

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A goiter is an enlarged form of which gland?

a. adrenal b. pancreas c. thyroid d. parathyroid e. thymus

Biology & Microbiology

A stable atom has ________ in its valence shell

A) 4 electrons B) 2 neutrons C) 8 electrons D) 8 protons E) 10 electrons

Biology & Microbiology