Question

the life cycle of a mosquito depends on the availability of standing or slow-moving water. if there is a lower-than-normal number of mosquitoes present in one area, which limiting factor is most likely the cause?
a. a severe drought
b. an abnormally mild winter
c. a reduction in pesticide usage
d. a decline in populations of insect-eating-birds
after many decades of being absent from yellowstone national park, gray wolves are being reintroduced. as the wolf populations have increased, elk and bison populations are beginning to decrease. which is another consequence of the reintroduction of wolves that is likely to occur in yellowstone park?
a. both elk and bison will become extinct.
b. populations of scavengers will decrease.
c. bears and coyotes will become more numerous.
d. populations of plants consumed by elk and bison will increase.
which process following meiosis restores the number of chromosomes in a cell and allows for the creation of new genetic combinations in an offspring?
a. budding
b. cytokinesis
c. fertilization
d. telophase
when the united states was being settled by europeans, the europeans brought plant seeds from their original countries. when these new plants began to grow in farms and gardens, what population change most likely occurred as a result?
a. new plant populations increased because they became more resistant to diseases.
b. native plant populations increased because they began producing extra seeds.
c. new plant populations decreased because native plants caused them to die.
d. native plant populations decreased because the new plants were invasive.

Explanation:

1. For the mosquito question: The question states mosquitoes rely on standing/slow-moving water. A drought removes this critical habitat, directly reducing their population. The other options would increase mosquito numbers or not impact them negatively.
2. For the Yellowstone wolf question: With fewer elk and bison overgrazing, the plants they eat will recover and increase in population. The other options are incorrect: extinction is extreme, scavenger populations would increase from more wolf kills, and bears/coyotes would not necessarily increase significantly.
3. For the meiosis follow-up question: Meiosis produces haploid gametes. Fertilization fuses two haploid gametes to restore the full diploid chromosome count and creates new genetic combinations from the two parent gametes.
4. For the introduced plant question: Non-native introduced plants often become invasive, outcompeting native plants for resources, leading to a decrease in native plant populations.

Answer:

1. a. a severe drought
2. d. Populations of plants consumed by elk and bison will increase.
3. c. Fertilization
4. d. Native plant populations decreased because the new plants were invasive.