Developing countries tend to have a(n) ________ age structure diagram
A) triangular-shaped
B) round
C) square
D) inverted-triangle-shaped
E) rectangular
A
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Amplification of DNA is accomplished by ________.
A. gene probes B. DNA sequencing C. the polymerase chain reaction D. a Southern blot E. a Western blot
True or False: If B = the benefit of a behavior to a recipient, C = the cost of the behavior of the donor, and r = the degree of relatedness between the recipient and donor, then if rB > C, altruism can evolve
A. true B. false
The arrival of an action potential at a synaptic terminal causes voltage-gated potassium channels to open
____________________ Indicate whether the statement is true or false.
Gravity-sensing mechanisms of many organisms are based on ____.
A. spicules B. statoliths C. uric acid crystals D. sclereids E. nematocysts