During a lunar eclipse, what is the penumbra? A. It is the part of Earth’s shadow where the sun is only partially blocked.

B. It is the part of Earth’s shadow where the sun is completely blocked.

C. It is the part of the moon’s shadow where the sun is completely blocked.

D. It is the part of the moon’s shadow where the sun is only partially blocked.

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.

Which term describes a normal value for something in the body? a. homeostasis b. set point c. feedback loop d. integration center

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body