What reptilian taxon is extant (has at least some members that are still living; opposite of extinct)?
A. Ornithischia
B. Squamata
C. Saurischia
D. theropods
E. ichthyosaurs
B. Squamata
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All microorganisms require
A) carbon, iron, and sodium. B) phosphorus, aluminum, and sodium. C) calcium, potassium, and magnesium. D) phosphorus, selenium, and sulfur.
The primary cells of the immune response are the T and B cells. T and B cells are types of:
A. natural killer cells B. antigens C. phagocytes D. lymphocytes
Amniotic eggs evolved as a means to
A. protect the embryo while the parent sits on the egg. B. protect the embryo from predators. C. prevent the embryo from drying out. D. allow the parent to gather food, not sit on the nest.
In the oceans, sulfur exists primarily as ________, and in rocks and sediments sulfur occurs mostly as ________ and ________
A) hydrogen sulfide (H2S) / gypsum (CaSO4) / elemental sulfur (So) B) hydrogen sulfide (H2S) / sulfate (SO42-) / elemental sulfur (So) C) sulfate (SO42-) / gypsum (CaSO4) / pyrite (FeS2) D) sulfate (SO42-) / sulfide (H2S) / elemental sulfur (So)