Which of the following can cause evolutionary change?
A) migration of individuals from a population that has a different allele
frequency.
B) non-random reproduction.
C) genetic drift in a small population.
D) Two of these are correct.
E) A, B, and C are all correct.
Answer: E) A, B, and C are all correct.
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According to the Shannon Diversity Index, which of the five blocks above, with each containing thirty-six squares, would show the greatest diversity?
A) 1 B) 2 C) 3 D) 4 E) 5
Which of the following gases was absent from the atmosphere of the early Earth?
a. carbon dioxide b. oxygen c. nitrogen d. water vapor
Atoms of isotopes
a. are electrically unbalanced. b. behave the same chemically and physically but differ biologically from other isotopes. c. are the same physically and biologically but differ from other isotopes chemically. d. have the same number of protons but a different number of neutrons. e. are produced when atoms lose electrons.
Immediately after an action potential occurs, the sodium channels close and cannot be reopened. What is this period called?
What will be an ideal response?