The net outcome of predator-prey interactions in the basic Lotka-Volterra models is that
A) the predator drives its prey to extinction and then goes extinct itself.
B) the prey population declines and this causes the predator population to also decline.
C) predator and prey populations eventually converge on equilibrium population sizes that are maintained into infinity.
D) predator and prey populations oscillate, with each predictably increasing and decreasing in response to the other.
D
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MOST of the early cases of toxic shock syndrome in women were associated with use of highly absorbent tampons
Indicate whether the statement is true or false.
Gastrulation produces
a. hollow balls of cells. b. embryos with primary tissue layers. c. solid balls of cells. d. maternal messages. e. all of these.
The development of memory B cells in response to an antigen requires the secretion of ________ from ________ cells.
A) tumor necrosis factor- : natural killer cells B) interleukin-2 : helper T cells C) interleukin-2 : cytotoxic T cells D) interleukin-6 : helper T cells E) interferon-gamma : cytotoxic T cells
Which gland is considered to be the master gland of the body?
a. pineal gland b. adrenal gland c. pituitary gland d. thyroid gland e. parathyroid gland