In 2005, the authors of the Millennium Ecosystem Assessment concluded that ________% of Earth's ecosystem services is being degraded
A) 5 B) 20 C) 60 D) 0 E) 95
C
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The neurotransmitter acetylcholine ____
a. speeds heart rate b. induces skeletal muscle contraction c. increases anxiety d. has a role in memory and learning e. dilates pupils
Which of the following statements about hydrostatic skeletons is true?
a. Compression of fluids causes movement of an animal body. b. Hydrostatic skeletons permit very precise and delicate movements. c. Fluid is moved throughout an organism due to alternating contractions of antagonistic muscles. d. Contraction of the inner circular muscles causes the body of an organism to shorten. e. Contraction of the outer longitudinal muscles causes the body of an organism to lengthen.
Cancer cells undergo apoptosis as regularly as normal cells.
Indicate whether the statement is true or false.
Contact inhibition means that
A. cells are able to divide without the presence of stimulatory growth factors. B. when cells come in contact with a neighbor, they stop dividing. C. cells have gained the ability to invade lymphatic and blood vessels. D. cells only divide a certain specified number of times and then quit. E. there are more chromosomes within the nucleus than there should be.