Human ventilation is
(a) negative pressure inhalation.
(b) positive pressure inhalation.
(c) negative pressure exhalation.
(d) both b and c.
(a) negative pressure inhalation.
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What is the function of a clitellum in earthworms?
a. anchoring an animal to its substrate b. digestion c. cushions organs d. glues two organisms together for sperm exchange e. keeps blood from clotting
Which of the following organs of the endocrine system secretes thyroxine and calcitonin?
a. pituitary gland b. pancreas c. hypothalamus d. adrenal glands e. thyroid gland
Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for all of the following functions EXCEPT ________
A) growth of a multicellular organism B) cell replacement C) production of sperm and eggs D) asexual reproduction
All of the following are examples of symbiotic relationships except
A. algae and fungi living together as a lichen. B. the protozoa that live in the intestine of termites and digest cellulose that termites cannot digest. C. the mosquito that visits a mammal for a blood meal. D. the malaria parasite that lives in the liver of humans.