(Q).
You are presented with the question "Fatty acids that circulate in the blood may contain other what?" and the following answer choices: - organs - Acids - Energy - Energy. - molecules - hydrocarbons - cell walls - waters Now knowing that lipids may consist of fatty acids alone, or they may contain other molecules as well and lipids are the fats that circulate in blood, choose the best answer.
(A).
molecules

(Q).
You are presented with the question "What does the human body use to repair cells?" and the following answer choices: - layers of fat - Enzymes - exercise - barrel-shaped - sweating - Amino Acids - energy - exoskeleton Now knowing that protein is used to repair cells by the human body and amino acids form protein, choose the best answer.
(A).
Amino Acids

(Q).
You are presented with the question "What harms the respiration system?" and the following answer choices: - Pollution - sweating - Pesticides - exercise - smoking - parasites - swimming - breathing Now knowing that smoking causes direct damage to the lungs and mammals are warm blooded, use lungs for respiration, and have four legs, choose the best answer.
(A).
smoking