Which statement best illustrates a biotic or an abiotic factor that is often found in a city park? a)decaying leaves are an abiotic factor because they are not living. b)rocks are an abiotic factor because they have never been alive. c)water in ponds is a biotic factor, because it provides a habitat for living things. d)oxygen is a biotic factor, because it is required for life and found in all living things.

Competition occurs between species when

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.

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they