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
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
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
Biology & Microbiology
The mammalian trachea and esophagus both connect to the _____
A) stomach B) pharynx C) rectum D) epiglottis
Biology & Microbiology