In vertebrates, the central nervous system (CNS) consists of the brain, spinal cord and cranial nerves
1.True
2.False
2
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Since an XO female can survive but an OY male cannot, what can we conclude about thegenetic information in the X and Y chromosomes?
A. YY males can survive B. XX females are healthier than XO females C. Males need at least one X chromosome to survive D. Females need the Y chromosome to survive
Which of the following is the direct cause of the dead zone in the Gulf of Mexico?
A. decomposition of algal blooms by aerobic bacteria B. eutrophication C. fertilizer runoff from agricultural fields D. increased growth of algal populations E. ocean acidification
Trichloroethylene (TCE) is toxic to humans because it
A. depletes nitrogen from soils. B. is carcinogenic. C. contains heavy metals. D. prevents CO2 production by plants. E. causes a decrease in the yield of crop plants.
This orchid attached to a tree branch is an example of ____
a. competition
b. parasitism c. predation d. commensalism e. mutualism