?Although estuaries are a mix of saltwater and freshwater, scientists classify them as marine systems.
Answer the following statement true (T) or false (F)
True
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In terms of volume and weight, the largest branch of the extractive industries is ________.
A. fossil fuel minerals B. fertilizers C. metallic minerals D. earth materials
Which of the following is true with regard to mutations?
a. Mutations are always harmful. b. Mutations always provide for beneficial changes in an organism's genetic makeup. c. Mutations are chosen by the organism to improve their survival. d. Natural selection determines the types of mutations that survive in a population. e. Mutations are caused only by harmful chemicals.
Mountains have crustal roots that help support them.
Answer the following statement true (T) or false (F)
The height of each element on this figure represents its electronegativity. Which elements would most likely form an ionic bond? 
A. elements in the middle, like copper (Cu) B. an element on the left side and an element on the right side of the Periodic Table C. an element that bonds with itself, like carbon (C) D. elements on the far right column of the Periodic Table