Students are each given 20 grams sample of an unknown solid compound in a clear plastic bag. They are instructed to break the material into smaller parts by gently hitting it with the hammer. Some of the parts break into large chunks and some look like a fine powder.

"a scientist studying a whale and its surroundings would need to understand the structure of atoms in case something was negatively affecting the whale or its surroundings."

explanation:

this was from the link provided:

b

is correct hope this   also i learnd this in middle school

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.