How do freshwater and saltwater compare in terms of their dissolved solids?

a; neither freshwater nor saltwater contains dissolved solids.

b: the amount of dissolved solids is 35 parts per thousand in both freshwater and saltwater.

c: the amount of dissolved solids is less in freshwater.

d: the amount of dissolved solids is less in saltwater.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

1. which of the following transport mechanisms utilizes energy? a. osmosis b. diffusion c. facilitated diffusion d. endocytosis

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the