The electric charge that eventually forms lightning is built up due to
a. static electricity in the air
b. sudden heating of the air
c. the movement of raindrops and hail within the cloud
d. the formation of raindrops out of rapidly condensing water vapor

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.

In the water cycle , when does water undergo a chemical change

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of