Which organs work harder when a person exercises?

Which of the following statements is true? a. the main cause for speciation is an increase in gene flow. b. organisms that reproduce asexually are not considered part of a species. c. on a tree of life diagram, speciation is shown by the merging of two different lineages. d. the size of the geographic area inhabited by a population can cause speciation.

What factors contribute to the effect an environmental toxin has on the human body?

During the process of blank and molecules such as a glucose must use a protein channel to cross through a cell membrane