The first fish evolved about 50 million years ago. Indicate whether the statement is true or false


ANS: F
Fish evolved approximately 500 million years ago. They had no jaws, but they possessed the chordate
body plan. Fish have evolved into many varieties to suit the endless niches and environments they
occupy. Information can be found in the section Fishes Are Earth's Most Abundant and Successful
Vertebrates.

Environmental & Atmospheric Sciences

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POTET never exceeds ACTET

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences

Economic mineral deposits of ____ are common in Carboniferous and Permian strata in the northeastern part of the

U.S., where they formed as organic sediments (i.e., the remains of plants) deposited in wetland environments west of the Appalachian Mountains. a. gold b. uranium c. platinum d. coal e. archaeocyathid

Environmental & Atmospheric Sciences

The difference between a resource and a reserve mostly has to do with certainty that it can be mined

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

Why do seismic waves follow strongly curved paths as they move through the interior?

A) Their paths are altered by changes in temperature. B) Their paths are altered by reflection off dense materials. C) Their velocities are altered by changes in chemistry. D) Their velocities are changed because of increasing pressure with depth.

Environmental & Atmospheric Sciences