Fossils are predominantly found in ____
a. metamorphic rocks
b. igneous rocks
c. sedimentary rocks
d. crystalline rocks
e. radioactive rocks
ANSWER: c
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The descending portion of the loop of Henle is
A. permeable to water and impermeable to sodium. B. permeable to water and permeable to sodium. C. impermeable to water and permeable to sodium. D. impermeable to water and impermeable to sodium. E. the site of active transport of water.
There are ______ classes of antibody
A. one B. three C. five D. seven
The electron transport chain is used to produce
a. ATP. b. carbon dioxide. c. oxygen. d. water
Today's atmosphere on Earth is made up of nitrogen, oxygen, carbon dioxide, and water. According to all models, which of these was largely absent 3.8 billion years ago?
A) nitrogen B) carbon dioxide C) oxygen D) water