Can be broken down in a human's liver and converted to atp

(lactic acid)  is the correct answer.

Explanation:

lactic acid can be broken down in a human's liver and converted to atp.

Cori cycle is the metabolic pathway, in this lactate which is produced by the method of anaerobic glycolysis.

The tolerance level of lactic acid is very limited in the human body,So the Lactic acid from the muscle moves out and enters the liver. As it enters into the human liver gets broken down, then it is converted into glucose and ATP.

explanation:

b. the carbon cycle ensures living things have a source of hydrogen