A deer that gets its energy from eating plants is a(n)
A) herbivore.
B) omnivore.
C) tertiary consumer.
D) producer.
E) carnivore.
A
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The oxygen-free gas commonly employed during anoxic incubation of a bacterial culture is a mixture of
A) nitrogen and carbon dioxide. B) nitrogen and carbon monoxide. C) nitrogen and argon. D) nitrogen and hydrogen.
Indirect development in sea urchins involves the presence of a _________________ stage.
Fill in the blank(s) with the appropriate word(s).
A uniform mixture is called a ____
a. concentration b. salt c. solute d. solution e. solvent
Many people, when they have a sinus headache, often use decongestant nasal sprays. Why are such sprays useful?
A) They have a pain-blocking effect in the brain. B) They dry out the breathing passageways in the pharynx, making it easier to breathe. C) They reduce swelling, allowing the sinuses to drain. D) They reduce the symptoms of sore throat inflammation, which exacerbates the pain.