(L2) Bacteria live in or among the root cells of many plants. The plants provide a home and nutrients to the bacteria. In return, the bacteria help the host plants absorb inorganic nitrogen from the soil to help make proteins. What type of symbiotic relationship do the
bacteria and plants have?
A. parasitism
B. commensalism
C. competition
D. mutualism

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

In what layer of the sun is energy transfers between atoms

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?