The first sphincter through which food passes is between the ____ and the ____

a. esophagus; stomach
b. pharynx; esophagus
c. stomach; small intestine
d. small intestine; large intestine
e. colon; rectum


ANSWER: a

Biology & Microbiology

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a. cytokinins b. abscisic acid c. oligosaccharins d. gibberellins e. ethylene

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Approximately 65.5 million years ago the Earth experienced a permanent loss of major groups of organisms during an event called ________

a. speciation b. continental drift c. genetic equilibrium d. mass extinction e. directional selection

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Four of the five drugs listed below are analgesics

Select the exception. a. endorphin b. opium c. heroin d. enkephalin e. Ecstasy

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You spot your friend Enrique and yell to get his attention, but he can't hear you. As you get closer to him, you clearly hear loud music coming from his headphones. What should you warn him about?

What will be an ideal response?

Biology & Microbiology