12. humans have had a tremendous impact on the environment. what has caused an increase in the amount of acid rain?

a. use of chlorofluorocarbons
b. use of pesticides
c. coal burning power plants
d. nuclear power plants
e. use of industrial acids in machinery work

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.