Humans have small mites that live in hair follicles and oil glands around the nose and eyelashes. What would you
need to know to classify them as exhibiting mutualism, commensalism, or parasitism? What will be an ideal response?
Concepts to Consider: In mutualism, benefits are conferred to both species involved (Do the
mites benefit? Do humans benefit from mites living in our skin?). Commensalism involves a
benefit to one partner and no benefit or harm to the other partner (If the mites benefit, do we
notice their presence?). Parasites benefit from the host, which is harmed to some degree
(Assuming the mites benefit, are we harmed?).
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Chapter 43 described an important experiment by Otto Loewi that demonstrated the existence of chemical neurotransmitters. Loewi used frog hearts in dishes that exhibited a regular heartbeat even when disconnected from the rest of the body. This experiment would not have been possible if these hearts lacked
A. sinoatrial nodes. B. atrioventricular nodes. C. neurogenic pacemakers. D. cardiogenic pacemakers. E. atrioventricular valves.
How many rounds of cell division occur in meiosis?
a. 0 b. 1 c. 2 d.3
Dissociation elements (Ds) in plants are examples of
A) activator transposons that can direct their own transposition. B) nonautonomous elements that require activation by an autonomous element. C) mutator genes that increase the spontaneous mutation frequencies of other genes. D) repeated sequences that are targeted by a transposase. E) Both B and C
If a plant produces microspores and megaspores, then by definition it is homosporous
____________________ Indicate whether the statement is true or false.