I see half of it and what are you working on?
A. Independent variable is the variable you change so the amount of BGH would change in each group
B. mass extinctions happen when populations crash due to overpopulation while background extinctions are more likely to result from disease.
Answer:
Something that can be tested, or rationalized.
Explanation:
You didn't give any statements to choose from, so I'll give you a rule of thumb. When finding a scientific statement, make sure it's something like "The tide is higher at noon than it was at 3 am." and not "Your dog is itchy, so that means a bad storm will arrive."
Heyy there.
I'm thinking that it would be B. or D. but idk exactly which one it is.
I hope you figure out wat it is.
B. Thinnest under the oceans and thickest under continents
D. Least dense layer overall, consists of two layers of different thickness
Good Luck and enjoy the rest of ur day!! ^^