Humans have an exaggerated impact on the ecosystem through the use of extra sources of energy and raw materials, in the production production of extra waste is that must be handled.

What roles do variation and retention play in natural selection? Define your terms

What will be an ideal response?

Statistically speaking, which of the following people is likely to be oldest when he or she becomes a grandparent?

a. Ralph, who is an African American man b. Tim, who is a White man c. Roberta, who is an African American woman d. Lynette, who is a White woman