What problems are associated with desalination?
What will be an ideal response?
First, desalination is a very expensive procedure. Energy is needed to heat seawater or to pump seawater through a high pressure filtration system. As a result, only wealthy water-starved nations can obtain their water by desalination. Second, the process of burning fossil fuels in order to generate needed energy to heat seawater is very polluting.
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Human population growth and expansion contribute to emergence of diseases
Indicate whether this statement is true or false.
Vacuoles for ingesting food and regulating their water balance are characteristic of
A. sporozoans. B. trypanosomes. C. ciliates. D. algae. E. spirochetes.
ACTH
a. is secreted by the posterior pituitary. b. has target cells in the autonomic nervous system. c. has target cells in the adrenal cortex. d. has target cells in the adrenal medulla. e. initiates the autoimmune response.
How does complement help in defense against bacterial invasion?
A) It promotes phagocytosis. B) It neutralizes bacterial toxins. C) It prevents bacteria from penetrating the skin. D) It fuses lysosomal granules to bacterial cell walls.