The concept of a molecular clock allows a population geneticist to estimate what?
A. how quickly mutations are occurring in all
species
B. how long two populations of the same
species have been separated
C. how frequently beneficial mutations will
appear in a population
D. how large a population is
B
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Indicate whether the statement is true or false.
Which ancestors of modern humans migrated out of Africa to populate the rest of the world?
a. Homo habilis b. Homo erectus c. Neanderthals d. Cro Magnon e. Homo sapiens
Approximately what percentage of the visible light that reaches Earth's producers is converted to chemical energy?
A) 10% B) 0.1% C) 1% D) 0.01%
Which of the following is not a type of neuron?
A. motor B. sensory C. afferent D. interneuron E. neuroglia