Sections of the geologic timescale are defined by:

A) the age of the rocks.
B) whether the rocks are metamorphic or sedimentary.
C) how close the rocks are to the surface of the earth.
D) the kinds of fossils present.


Answer: D

Biology & Microbiology

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a. disulfide b. hydrogen c. ionic d. peptide e. noncovalent

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

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Placental mammals give birth to more fully developed offspring than marsupial mammals and therefore have a greater chance of survival. This helps to explain why placental mammals from North America displaced many native South American marsupial mammals when a land bridge formed between the two continents.

a. true b. false

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