The mode of speciation characteristic of a single evolving lineage of species is referred to as .

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Explain how the political influence of african americans leaders became weaker.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?