Which of the following has a four-chambered heart like humans?
A. crocodiles
B. amphibians
C. birds
D. birds and crocodiles.
E. All of the choices are correct.
Answer: D
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Explain the reasoning behind the laws in some European countries that limit the number of children that can result from a single sperm donor. Do you agree with these restrictions? Why or why not?
What will be an ideal response?
Why do higher-latitude ecosystems experience more pronounced seasons than ecosystems at equatorial latitudes?
A) Earth is tilted on its axis as it orbits the sun annually. B) The mass of the continents is greater at the equator, which evens out temperature variations in ocean circulation. C) Heated air rises at the equator and falls at mid-latitudes. D) Air currents generated by Earth's rotation have stronger effects at higher latitudes. E) Ocean currents moderate near-shore environments.
A virgin pine forest covers a valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and separates the valley with a huge lava flow, thus producing two populations of squirrels. What must occur for the two populations of squirrels to be considered separate species?
A. The two squirrel populations must select mates using different behaviors. B. The two squirrel populations must be reproductively isolated. C. The environment must change so that the populations exist in distinct habitats. D. The two squirrel populations must feed on different species of plants. E. The fur color or other morphological characteristic of the two squirrel populations must become distinct.
Choose the letter of the best match from the following:A. abscisic acidB. trichomesC. aquaporinD. endodermisE. stomaPore in leaves that regulates gas exchange.
Fill in the blank(s) with the appropriate word(s).