Plz select all that apply. the following factors threaten north america's ecosystems.
introduction of non-native species
increased biodiversity
pollution
overgrazing
chemical agents
habitat loss

The correct answers are:

- introduction of non-native species;

The invasive species are often very dangerous for the native species, and that is because they manage to out-compete them for the needed resources.

- pollution;

The pollution is a huge problem, as it is systematically destroying the environment, and the proper functioning of the ecosystems.

- overgrazing;

It is contributing to the lowering of the food sources for the wild animals.

- chemical agents;

Extremely dangerous, and poisonous for the plants and animals, either destroys their environment, or kills them directly.

- habitat loss;

The loss of the habitat effects every living organism as it is the place where they live and manage to function.

analyze the map below and answer the question that follows.

what does the map above tell us about the endemity of typhoid fever?

a.

there is greater occurrence of the disease in the western hemisphere.

b.

there is greater occurance of the disease in the northern hemisphere.

c.

countries located in equatorial regions are more likely to have incidents of typhoid fever.

d.

typhoid fever is more rampant among caucasian populations.

the answer is a hope this