A plant appears green because
A. its chloroplasts use green wavelengths of light.
B. chlorophyll a absorbs red and blue light.
C. chlorophyll a absorbs ultraviolet light.
D. Both a and c are correct.
Ans: B. chlorophyll a absorbs red and blue light.
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The implement of what piece of modern technology led to the discovery of living organisms in the dark, deep waters of the world ocean?
a. none of these choices b. Transatlantic television cables c. Transatlantic dredging ships d. Transatlantic telegraph cable
In some traits, different phenotypes result from genes whose alleles each contribute a specific increment to the whole. The phenotypes then have a ________ phenotypic distribution
Fill in the blank(s) with correct word
The difference in carrying capacity between the two species when cultured separately is closest to which of the following values?
(A) 0 individuals per 5.0 mL (B) 60 individuals per 5.0 mL (C) 150 individuals per 5.0 mL (D) 350 individuals per 5.0 mL
In its youth, a pet parrot was owned by someone who kept the wings clipped and never allowed it to fly. Later in life, the new owner let the feathers grow and let the parrot fly around the house. But the parrot kept knocking over lamps and crashing into walls. "Wow," said the owner, "I guess parrots are just too clumsy to fly around a house without destroying everything." What is an alternative explanation?
A. Since the parrot was not able to practice flying during the critical period for flight development, the brain circuits for accurate flying were not able to develop. B. The critical period for flying development in the brain has just now begun with the bird's first attempt. In a few weeks the critical period will end, so it must practice during this time. C. The parrot just needs more practice flying -- although it did not get to fly when young, this should not affect later ability. D. In nature, parrots have much more room to fly, and do not have to navigate around delicate home decor.