Endocrine function typically involves
A. coordinated activity of several hormones.
B. single hormones responding to nervous stimulation.
C. hormones being used in the immediate vicinity of their place of production.
D. gland cells being transported to where they are needed.
A. coordinated activity of several hormones.
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a. uterus b. oviduct c. urethra d. placenta
The ______ includes all the ocean’s open water.
a. aphotic zone b. photic zone c. benthic zone d. pelagic zone
Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changing
A) chemical energy into kinetic energy. B) chemical energy into potential energy. C) kinetic energy into potential energy. D) kinetic energy into thermal energy.
Which of the following is a nitrogen-fixing bacterium that forms associations with the roots of plants?
A. anaerobic Bacillus species B. Clostridium species C. Rhizobium species D. Azotobacter species E. cyanobacteria