The three stages of cellular respiration are glycolysis, krebs cycle, and the electron transport chain. when do cells exhibit all these stages?
a.
in the absence of oxygen only
b.
in the presence as well as in the absence of oxygen
c.
in the presence of oxygen only

Which sequence correctly shows the path of carbon dioxide during repiration?

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?

The negative impacts of nonnative species generally outweigh the positive impacts