Excretory systems maintain homeostasis through all of the following except:a
adjusting the concentrations of various substances in body fluids.
b. removing excess water from the body.
c. adjusting body temperature.
d. ridding the body of harmful substances.
e. removing metabolic wastes from the body.
C
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The variables that investigators try to keep the same for both the experimental and the control groups are
(a) independent. (b) controlled. (c) dependent. (d) a and c.
The relationship above is
a. a parasitic association. b. predation. c. resource partitioning. d. a mutualistic association essential to the fish but not the anemone. e. none of these.
If a small region of a chromosome containing a non-essential gene is completely deleted, and an organism has two identical chromosomes with this deletion, then the organism
A) has no alleles of that gene. B) is dead. C) has more heterochromatin. D) has recessive alleles of those genes. E) will exhibit pseudodominance.
What is the name of the dartlike protein threads that ciliates can eject from surface organelles when under attack?
a. gullets b. alveoli c. trichocysts d. vacuoles