Plant hormones
A) must be produced in large quantities to be effective.
B) act on all cells they encounter.
C) are chemical signals that influence growth and development.
D) are rare and produced only in response to stress.
Answer: C
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Helicobacter pylori is a principal causative agent of
A. gastroenteritis. B. toxic shock syndrome. C. human ehrlichiosis. D. peptic ulcer disease.
What is the predominant hypothesis for why animals only appeared in the fossil record about 3 billion years after life originated?
A. There were animals 3 billion years ago; they just weren't fossilized. B. Animals are warm-blooded; the ocean was too cold for animals to evolve 3 billion years ago. C. Animals have higher metabolisms, and animal diversification and evolution didn't really happen until there was sufficient oxygen in the atmosphere. D. Animals are heterotrophic and couldn't evolve until there were enough photosynthetic organisms on Earth to support being eaten by animals.
The last structure that air moves through in
mammals before entering the alveoli is(are) the a. larynx. b. bronchi. c. bronchioles. d. trachea. e. pharynx
The voice box is also referred to as the:a
larynx. b. nasal cavity. c. epiglottis. d. pharynx. e. trachea