Populations rarely reach their biotic potential because ________
a. species cannot breed quickly enough
b. the death rate always exceeds the birth rate
c. there are limiting factors on population growth
d. all of the choices
c
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Early microscopes did not allow clear visualization of cells because they were limited by
A) magnification. B) number of kernels. C) resolution. D) refraction. E) both choices A and C
Which of the following is not true of schistosomiasis?
A. Larvae called cercariae can penetrate intact skin through hair follicles. B. Freshwater snails are the intermediate host. C. Schisotosomiasis cases are beginning to appear in the southern U.S., as climate change brings warming waters to the region. D. Schistosomiasis covers its outer surface with blood proteins to escape detection by the immune system. E. Schistosomiasis is caused by blood flukes.
Which endocrine gland is the main center for control of the internal environment?
A. Pineal B. Hypothalamus C. Thyroid D. Adrenal cortex E. Thalamus
A(n) (photosynthetic/algae/plant) organism makes its own food using light energy
What will be an ideal response?