A hypothesis refers to a(n)
A) phenomenon that is observed but is not yet understood.
B) testable explanation for an observed phenomenon.
C) untestable explanation for an observed phenomenon.
D) falsified explanation for an observed phenomenon.
B
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Which of the following is correctly listed from smallest to largest scale?
a. organism, microhabitat, macrohabitat, life zone b. microhabitat, organism, life zone, macrohabitat c. macrohabitat, microhabitat, life zone, organism d. life zone, macrohabitat, microhabitat, organism
Which of the following is not true? a. Biological wealth can be exploited to discover useful chemicals
b. Governments must choose between policies good for their economies and policies good for the environment. c. Zea diploperennis was thought to be extinct until rediscovered by a Mexican college student. d. Wild maize, Zea diploperennis, is being protected for its genetic diversity and potential to help improve crops.
If the size of a cell doubles what will be the
surface area to volume ratio?
a. 8 to 4 b. 4 to 8 c. 16 to 4 d. 16 to 8 e. 64 to 16
Which two observations led Darwin to conclude that there is competition for survival?
A) Overproduction and limited resources B) Fossils and mutations C) Gene and allele differences in organisms D) Natural selection and descent with modification