The spinal cord runs through the vertebral column
and connects with the brain through the __________. Fill in the blank(s) with the appropriate word(s).
Answer: foramen magnum
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Biosphere 2 was an attempt by scientists to build a completely closed ecosystem in Arizona. It failed
because of the
a. decreased level of oxygen through respiration by soil microorganisms. b. contamination of food by soil microorganisms. c. disease outbreak caused by soil microorganisms. d. increased level of carbon dioxide produced by photosynthetic microorganisms. e. inability of soil microorganisms to recycle nitrogen.
An epidemic facilitated by a high, dense
population is an example of a ___ factor.
a. density-dependent b. density-independent c. biotic d. logistic e. exponential
Which hormone deficiency would lead to a female that is not ovulating?
A. follicle-stimulating hormone B. epinephrine C. cortisol D. testosterone E. calcitonin
A good average value for the amount of energy that reaches the next trophic level is about
A. 20%. B. 10%. C. 5%. D. 2%. E. 1%.