Which of the following best describes cnidarians?
A. They have radial body symmetry, tissues, and stinging cells.
B. They are asymmetrical and have tissues and stinging cells.
C. They have radial body symmetry, lack tissues, but have stinging cells.
D. They have radial body symmetry and tissues but lack stinging cells.
Answer: A
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In 2007, research confirmed the existence of hormones that control the timing of flowering. These hormones are called
A) abscisic acids. B) florigens. C) cytokinins. D) auxins. E) ethylenes.
Select the TRUE statement(s) about respiratory diseases. (Select all that apply.)
a. Severe mountain sickness can cause pulmonary edema. b. Smoking often damages alveolar walls, making oxygen delivery difficult or impossible. c. At high altitudes, humans adapt by enlarging the lungs and increasing the number of alveoli. d. Severe mountain sickness causes pulmonary edema due to high pressures in the pulmonary artery, induced by hypoxia and the sympathetic nervous system.
In an uncharged atom, the number of protons and ___________ must be equal.
A) electrons B) neutrons C) neurons D) ions E) particles
What does the word sarco mean?
A. short B. smooth C. large D. tubule E. muscle