Question

can you answer these questions

While walking to the kitchen in the middle of the night, Jamal tripped over an object that he could not see in the dark. Which part of the CNS sent a signal to help prevent Jamal from falling?
cerebrum
hippocampus
cerebellum
brain stem

Which form of natural selection does the graph represent?

A graph has trait value on the horizontal axis and proportion of individuals on the vertical axis. The original population increases to a maximum point at the center, and then decreases. The population after selection increases, decreases, increases, and then decreases again. The maximum of the original population is the minimum of the population after selection.
directional selection
disruptive selection
sexual selection
stabilizing selection

Which of the following examples can cause gene flow between populations?
an increase in predators to a population of zebra
a volcanic eruption that kills half of a population of mice
bird droppings that contain seeds from a different location
a person that sprays a toxin on a group of mosquitoes

Many scientists are concerned that the Ogallala aquifer in the United States is being depleted at an alarming rate. What would most likely be a major effect of this aquifer running dry?
Many crops would die because irrigation water would be limited.
The water cycle would come to a halt in the area.
Farmers would have to water crops with salt water.
Most people in the United States would not have drinking water.

Kudzu is a vine that was brought to the United States from Japan to prevent erosion. Once here, kudzu became invasive. What role does kudzu most likely play in the environment in the United States?
Kudzu experiences loss due to overeating by livestock.
Kudzu is very susceptible to harsh winter conditions.
Kudzu outcompetes native plants for sunlight and nutrients.
Kudzu reproduces at a slow rate.

Answer 1

Here are the answers with short explanations:

1) Cerebellum — it coordinates balance and posture and sends corrective motor signals to prevent falls.
2) Disruptive selection — the center of the trait distribution is selected against while the extremes are favored.
3) Bird droppings that contain seeds from a different location — that moves alleles between populations (gene flow).
4) Many crops would die because irrigation water would be limited — the Ogallala supplies irrigation for large agricultural areas.
5) Kudzu outcompetes native plants for sunlight and nutrients — as an invasive species it displaces natives by rapid growth and resource use.