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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Homo sapiens first appeared during the
A. Tertiary period. B. Cretaceous period. C. Mesozoic era. D. Quaternary period. E. Permian period.
Biology & Microbiology
A goiter is an enlarged form of which gland?
a. adrenal b. pancreas c. thyroid d. parathyroid e. thymus
Biology & Microbiology
Which type of animal would you dissect to locate a nephridium?
A) Reptile B) Bird C) Insect D) Earthworm E) Flatworm
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