Cancer
A) is usually caused by a single mutation in a key gene.
B) is more likely to develop in older people or people who have been exposed to mutagens (mutation-causing agents).
C) usually involves a mutation in the BRCA genes.
D) is primarily an inherited, and not an environmental, disease.
B
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Sea otters play a role in maintaining the biodiversity of which ecosystem?
a. Tidepools b. coastal kelp forests c. coastal sandy beaches d. open ocean areas e. Estuaries
The ________ is the most prominent feature on the ocean floor
Fill in the blank(s) with correct word
Deserts are classified on the basis of
A. temperature. B. precipitation. C. pressure. D. plant and animal life.
The Roman Empire introduced______________ to Europe.
-currency -specialization of goods -exploration -both a common infrastructure and specialization of goods -a common infrastructure