What type of skeleton is an internal fluid filled
chamber?
a. hydroponic
b. hydrostatic
c. hydrophobic
d. hydrophilic
e. endoskeleton
B
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Which of the following is a way in which bacteria help the environment?
A. They are used to clean water in sewage treatment facilities. B. They remove pollutants from the environment. C. They break down dead organisms in the soil and recycle nutrients. D. All of the above are ways in which bacteria help the environment.
Blood returning to the heart enters:
a. a ventricle b. the aorta c. an atrium d. a capillary bed e. all of these
Exotoxins differ from endotoxins in that exotoxins
A) are composed of lipopolysaccharides. B) are stable at 60°C. C) cannot be converted to toxoids. D) are secreted from living cells.
The islets of Langerhans produce bicarbonate.
Answer the following statement true (T) or false (F)