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
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Squids are examples of ____
a. cephalopods b. pseudopods c. monopods d. gastropods e. polypods
What kind of bonds link amino acids to form the basic sequence of a protein?
a. disulfide b. hydrogen c. ionic d. peptide e. noncovalent
Answer the following statements true (T) or false (F)
1.Negative feedback is the most common way that living organisms maintain homeostasis. 2.If body temperature is too high, the hypothalamus stimulates blood vessels in the skin to constrict. 3.The nervous system of a cat is more similar to the nervous system of a human than to the nervous system of a crayfish. 4.Damage to the pons would lead to problems with posture. 5.The autonomic nervous system controls voluntary muscles involved in processes such as moving legs while consciously walking.
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