In general, less complex animals are:
a. more likely to rely on specialized mouth parts for digestion.
b. more likely to perform extracellular digestion than intracellular digestion.
c. more likely to have a gastrovascular cavity than to have a digestive tract.
d. more likely to have two body openings than to have one body opening.

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.

Contrast how pollination is different among gymnosperms and angiosperms.

Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?