Chris drew a diagram to compare the ways in which different organisms obtain nitrogen. Venn diagram with two intersecting circles. One circle is labeled Consumers and has the label X within it. The other circle is labeled Producers.
Which label belongs in the area marked X?

breathe in from atmosphere
produce themselves
eat other organisms
absorb from soil

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?

Did you know that a blue wales tongue weighs more than an elephant?

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.