Devils Tower is primarily made of a greenish rock called phonolite. The Giants Causeway is made of black rock called basalt. (Imagine of phonolite) (imagine of basalt)

Compare the opinions of the two rocks. What did their appearances suggest about the composition of each rock?

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

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.

Abnormal softening of a gland is known as