The beautiful fall leaves get their orange and yellow colors from carotenoids

a. True
b. False


ANSWER: True

Biology & Microbiology

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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

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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

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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.

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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.

Biology & Microbiology