Answer:
1,3,4
A dichotomous key uses questions or statements to help identify organisms, it also uses characteristics in it's questions ( that may be yes-no) and statements to help separate organisms from one another.
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Explanation:
Answer:
B) geology; theory of continental drift
Explanation:
The answer is the letter B. Electrical signals.
*Our brain and body communicates with each other by sending messages in the form of electrical signals.
Answer:
The substances used in the beginning of a chemical reaction are called the reactants and the substances found at the end of the reaction are known as the products.
Explanation: