In individuals with cystic fibrosis:a
the mucus enhances the action of the cilia that line the bronchi.
b. the mucus prevents the growth of dangerous bacteria in the respiratory system.
c. the mucus in the respiratory system is thinner than in unaffected individuals.
d. abnormal mucous secretions occur throughout the body systems.
e. abnormal mucous secretions inhibit infections by bacteria.
d
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Rock reefs contain several ________ including overhangs and crevices
a. subterranians b. communities c. microhabitats d. substrates
Which statement best describes active transport?
A) A substance goes from an area of low concentration to an area of high concentration, and this releases energy. B) A substance goes from an area of high concentration to an area of low concentration, and this requires energy. C) A substance goes from an area of low concentration to an area of high concentration, and this requires energy. D) A substance goes from an area of high concentration to an area of low concentration, and this releases energy.
Which of the following is a characteristic of annelids?
A. radial symmetry B. cephalization C. psuedocoelom D. closed circulatory system E. incomplete digestive tract
The negative logarithm of the hydrogen ion concentration in the solution is referred to as
A. electronegativity. B. specific heat. C. pH. D. atomic mass. E. OH- concentration.