Infection travels to the middle ear by way of the ________.

A. auditory canal
B. subarachnoid space
C. eustachian (auditory) tubes
D. nasal cavity
E. sinuses


Answer: C

Biology & Microbiology

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One of the reasons study of nitrogen use in plants is of special interest is because:

A. Nitrogen is limited in our atmosphere. B. Nitrogen in its atmospheric form is not useable by plants. C. Nitrogen is often toxic to plants. D. None of the forms of nitrogen are easily absorbed by plants. E. Nitrogen is not an essential element for plant growth.

Biology & Microbiology

Glycolysis takes place in ____

a. the cytoplasm b. mitochondria c. chloroplasts d. thylakoids e. peroxisomes

Biology & Microbiology

__________ are free-living and usually kill their

prey. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following represents the lowest degree of certainty?

a. hypothesis b. conclusion c. fact d. principle e. theory

Biology & Microbiology