If the objective lenses of a microscope can be changed without losing focus on the specimen, they are said to be ________.

A. totifocal
B. parfocal
C. optifocal
D. equifocal


Answer: B

Biology & Microbiology

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__________________ Indicate whether the statement is true or false.

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The courtship rituals of many related animals are highly species-specific and prevent the related species from mating. This is an example of 

A. habitat preference. B. ecological isolation. C. seasonal isolation. D. behavioral isolation.

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Conducting tubes of phloem consist of stacks of ____.?

A. dead sieve elements
B. living sieve elements
C. dead vessel elements
D. living vessel elements
E. dead companion cells

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Flagella all over the cell is known as...

a. amphitrichous b. lophotrichous c. boutatrichous d. peritrichous

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