Which of the following describes how the septum in the heart affects blood flow? a.) it pumps blood out of the heart to the rest of the cardiovascular system when heart muscles contract. b.)it separates the heart's left and right sides to keep oxygenated and deoxygenated blood from mixing. c.)it separates the heart's upper and lower chambers to keep incoming and outgoing blood from mixing. d.) it accepts blood into the heart from the rest of the cardiovascular system when heart muscles relax.

a. the production of carbon dioxide through the process of photosynthesis

bc blah

explanation:

bc blah

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation: