Respiration is a physiological process by which O2 enters the internal environment and CO2 leaves by diffusing across
a(n) __________. Fill in the blank(s) with the appropriate word(s).
ANSWER: respiratory surface
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Human gonads have two functions: to produce gametes and to secrete hormones that are responsible for sexual development and mating behavior
1.True 2.False
The data from the butterfly experiment reflected
which of the following? a. natural selection b. food choices by predators c. the ability of birds to find the prey d. the role of mimicry e. all of these
Which statement is false?
a. Reflexes are the simplest of all nervous reactions. b. Reflexes are automatic responses. c. Motor neurons lead toward the brain or central nervous system. d. Reflex actions are stereotyped and repeatable. e. Sensory neurons conduct impulses from the receptor to the central nervous system
Keratitis is usually caused by ________.
A. Neisseria gonorrhoeae B. Staphylococcus aureus C. herpes simplex virus type 1 (HSV-1) D. Streptococcus pyogenes