How do levels of acid rain and so2 emissions relate to each other

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.

How can you keep track of variables in a science experiment?

What feature of cell theory is best demonstrated in the image