Class characteristics are those associated with what? a particular thing a group ideas they cannot associated with anything

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.

Why should the united state be concerned about air pollution in china?

What percentage of light hits earth's surface directly?