The different versions of genes that code for hair color and length are examples of
__________.
a. alleles
b. meiosis
c. chromosomes
d. gene flow
A
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The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum
a. near the radio emission of water. b. near the radio emission of oxygen molecules. c. between the radio emissions of hydrogen and oxygen. d. between the radio emissions of hydrogen and OH. e. near the radio band where water in the Earth's atmosphere strongly absorbs energy.
The control in an experiment ____
a. makes the experiment invalid b. is an additional replicate for statistical purposes c. reduces experimental errors d. minimizes experimental inaccuracy e. allows a standard of comparison for the experimental group
During inhalation, air moves from the pharynx directly into the trachea
____________________ Indicate whether the statement is true or false.
A human population will achieve zero population growth if
A) no couple has more than 2 children. B) couples have an average of about 2.25 children each (to account for some children who do not survive to reproduce). C) no couple has more than 1 child. D) the birth rate equals the intrinsic rate of increase r.