Biodiversity hot spots are: A. regions with the potential for high levels of extinction
B. distributed evenly throughout the biosphere
C. the same for all groups of organisms
D. relatively resistant to environmental degradation due to their large number of species

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

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.

Describe the function of the endomembrane system? what organelles are involved?