The beautiful fall leaves get their orange and yellow colors from carotenoids
a. True
b. False
ANSWER: True
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Polar bears are top predators, and tests on their
tissues have shown a surprising a. resistance to warming. b. amount of protein. c. resistance to disease. d. amount of mercury and organic pesticides. e. evidence of none of these
Smog forms when pollutants in the air react with each other in the presence of sunlight and carbon dioxide
Indicate whether the statement is true or false
The first system to develop in the vertebrate embryo is the:a
circulatory system. b. digestive system. c. excretory system. d. reproductive system. e. nervous system.
Homologous chromosomes recognize one another by their centromeres, move through the cell toward one another, and come to lie next to each other in a process called
A. crossing over. B. synapsis. C. differentiation. D. trisomy.