Water-conducting cells that have a small diameter and tapered ends are called

A) vessel elements.
B) tracheids.
C) sieve-tube elements.
D) collenchyma cells.
E) companion cells.


B

Biology & Microbiology

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A chromosome that has a centrally-placed centromere is called ____________________

Fill in the blank(s) with correct word

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The success of human populations resulted from ____

a. their ability to solve ecological problems b. a stable climate c. their society d. their hunting ability e. absence of predators

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Who proposed the law of independent assortment?

a. Morgan b. Mendel c. Darwin d. Cuvier e. Flemming

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Four of the five answers listed below are related by a common source. Select the exception

a. glucocorticoids b. sex hormones c. cortisol d. adrenalin (epinephrine) e. mineralocorticoid

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