Experiments are carried out to test a hypothesis by changing one variable at a time and including an unchanged variable termed a(n) _____.
A. experimental variable
B. altered variable
C. control
D. stable variable
C. control
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Muscles whose fascicles are arranged in a pattern that resembles a feather are referred to as pennate muscles.
Indicate whether the statement is true or false.
The first function of feathers was most likely:a
protection from predators. b. insulation. c. communicating with rivals. d. climbing in trees. e. protection from parasites
All of the following are true about the members of the Kingdom Plantae except
A) They are multicellular. B) They have eukaryotic cells. C) They can photosynthesize. D) They use organic carbon sources. E) They use inorganic energy sources.
The process of conversion of ammonia to nitrate is referred to as ________.
A. nitrogen fixation B. denitrification C. nitrification D. ammonification