What connection could there be with increased temperatures in the Arctic Circle and the relative closeness of America?

What was carolus linnaeus' classification system of organisms based on? a. physical characteristics of organisms b. food habits of organisms c. habitat of organisms d. size of organisms

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?

You find a fossil that you are sure shows evidence of bipedalism. you know this because which of the following anatomical traits is present? a. thighbones that angle in toward the knees b. a narrow pelvis c. opposable hallux d. posterior position of the foramen magnum