Major changes in ocean conditions during the early Cambrian period were probably linked most closely to the evolution of __________.
a. cyanobacteria
b. algae
c. suspension-feeding animals
d. large and motile predatory animals
e. vertebrates
Answer: c. suspension-feeding animals
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Compound B is a ____________________.
Assume that you are taking an organic chemistry class. Your teacher has given you four organic compounds to analyze. She tells you that one is a carbohydrate, one is a hydrocarbon, one is a nucleic acid, and one is a protein. You discover that Compound B contains only carbon, hydrogen, and oxygen. Of the four types of compounds which were given to you to analyze, which one best describes Compound B?
Spermatophytes are
A. all plants that produce sperm. B. all living and fossil seed plants. C. all plants that have tracheids and phloem. D. all woody plants.E. all plants with a sporic life cycle.
Nicotine is a highly addictive stimulant that causes
all of the following effects EXCEPT a. blood vessel constriction. b. increase in blood pressure. c. decrease of low density lipids (LDLs). d. clogging of arteries. e. strokes.
When the number of births plus immigration exceeds the number of deaths plus emigration, a population size will increase.
Answer the following statement true (T) or false (F)