Government sources estimate that approximately percent of the homeless population is suffering from a serious mental illness, and if mental illness is broadened to include clinical depression and substance abuse disorders that percentage jumps to percent.

20-30%; 50-80%.

Explanation:

Homeless people have much tendencies to have bad mental challenges than people that have home because not having a roof on one's head can affect the Psychological reasoning of such set of people.

But the fact that homeless people are prone to bad mental disorder does not mean that people that have home do not have bad mental health.

According to researches about 20-30% homeless population have Mental health challenges and if we are to include challenges such as depression and substance abuse disorders the percentage will be 50-80% which shows that more people are suffering from clinical depression and substance abuse disorders.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.