Wildlife biologists are attempting to monitor the population size of the insect pest known as the gypsy moth (lymantria dispar) during the summer months. to estimate the total population size of these insects living in a 50 square kilometer forest, biologists have sampled 10 random trees, counting the number of eggs and larvae on each selected tree. which factor should be modified to improve the overall experimental design? a) the sample size should be increased. b) data should be collected all year long. c) weather conditions should be controlled. d) researchers should include other insect species.

the answer is A) The sample size should be increased.

The number of trees sampled must be sufficiently large to minimize random sampling error. Gypsy moths are dormant during the winter months; other insect species are not of interest; scientists cannot control the weather.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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