Answer:
refractory period is the correct answer.
Explanation:
A refractory period happens when the muscle and nerve are unable to respond to the additional stimulation temporarily.
A refractory period occurs because sodium ions channels are not activated during this period.
The refractory period differs among the individuals, it ranges from minutes to a day.
During this period many are temporarily not interested in sexual activity and their penis can be hypersensitive or some of the men are not able to sustain an erection during this period.
Answer:
C
Explanation:
Photosynthesis occurs in chloroplasts
Answer:
a. The corn borer must have or generate (by mutation) heritable variation in resistance to the toxic protein.
b. The resistant corn borers must survive better or reproduce more than nonresistant corn borers.
Explanation:
When there is a change in the surroundings of organisms, some genetic variations become beneficial to the organisms. Natural selection favors the organisms having these genetic variations.
The development of resistance in the corn borer population requires the presence of the gene for the resistance in the population. If there is no gene already present in the population, there should be a mutation to give rise to such gene/s. The corn borers having this gene should be able to survive better in the presence of the toxic protein and should leave more progeny in order to increase the frequency of the gene in the population over the generations.
