Which of the following is ultimately responsible for introducing new alleles into a population?

A) mutation B) natural selection C) genetic drift D) sexual selection


Answer: A

Biology & Microbiology

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In the pine life cycle, fertilization often takes place ____ pollination

a. at the same time as b. a few days after c. a few weeks after d. a few days before e. months to a year after

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To conserve heat in a cold environment and to cool vital parts of the body under heat stress, some animals have a ________ heat exchange system

Fill in the blank(s) with correct word

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The mammalian trachea and esophagus both connect to the _____

A) stomach B) pharynx C) rectum D) epiglottis

Biology & Microbiology

Urine is moved through the ureter to the bladder by muscular contractions known as ____.

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

Biology & Microbiology