What is altruism?
A. Acts that cost the actor but do not benefit another
B. Acts that cost the actor and benefit another
C. Acts that do not cost the actor and do not benefit another
D. Acts that do not cost the actor and benefit another
Answer: B. Acts that cost the actor and benefit another
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____ is an element that is abundant in Earth's atmosphere; however, usable forms of this element (such as ammonia) are comparatively rare in certain soils. To circumvent this problem, soybean plants form symbiotic relationships with bacteria
Fill in the blank with the appropriate word.
Which of the following has identical molecular formulas but different structures and characteristics?
A. isomers B. sterioisomers C. enantiomers D. isomers, but not sterioisomers E. isomers, sterioisomers, and enantiomers
Cell differentiation of a pre-embryo begins
A) immediately upon the first division of the fertilized egg. B) after the 32-cell stage. C) after the 4-cell stage. D) after the 8-cell stage. E) after the 2-cell stage.
Pigments absorb wavelengths of light from all ranges of the electromagnetic spectrum
a. true b. false