The pesticide ddt was widely used in the 1940s as a method of insect control. in the late 1950s the first ddt-resistant mosquitoes were discovered, and eventually ddt-resistant mosquitoes were found globally. when ddt is used now, the development of ddt resistance in mosquito populations occurs in months rather than years.

which of the following best explains the observations concerning ddt resistance in mosquitoes?
a. competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of ddt
b. the proportion of ddt-resistant mosquitoes in a population remains constant due to the metabolic costs of ddt utilization
c. natural selection favors ddt-resistant mosquitoes that are already present in a population when ddt exposure occurs
d. ddt is a chemical signal that delays normal reproductive cycles in many mosquito populations

Briefly describe the scenario that was discussed in the behaving brain that demonstrated that the brain can change based on state or mood. which disease could the research involving rats and learning experiments that was discussed in the behaving brain ultimately with? in the behaving brain, what is a common misunderstanding about amnesia that was mentioned? what is the truth about amnesia that's mentioned? what does research discussed in the responsive brain show to be different in men and women's reaction to touch? what was discussed in the responsive brain as being brain-based and a vital part of normal growth and development in young children? in the responsive brain, what do they discuss as a possibility for leading to deficiencies in cognitive impairment as we age? in the responsive brain, what did the research involving african cichlid fish demonstrate? briefly describe the back story and affliction of the author of peter pan. what did you find most interesting about the behaving brain video, and why? what did you find most interesting about the responsive brain video, and w

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?

Which of these would most likely be a stimulus that would cause the body to initiate feedback mechanisms a.) normal body temperature in an arctic environment b.) normal boy temperature in a tropical environment c.)light physical activity d.)low blood sugar