When oxygen is present in the environment, methylene blue is ______.
A) blue
B) colorless
A) blue
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In early vertebrates, which component of the brain was devoted largely to coordinating motor reflexes?
A. thalamus B. forebrain C. midbrain D. hindbrain E. medulla oblongata
Ribosomes are composed of
a. proteins only. b. proteins and DNA. c. proteins and RNA. d. glycolipids and DNA. e. glycolipids and RNA.
Ecosystems lose energy in the form of ____
a. metabolic heat b. sunlight c. carbon dioxide d. oxygen e. decomposition
Social behavior occurs in groups, but not all groups display social behavior. Groups that display social behavior often have
A. some individuals doing one job and others in the group doing different jobs. B. long periods of contact between parents and offspring. C. elaborate methods of communicating among individuals in the group. D. All of these answers are true.