ATP ADP
lactic acid
mitochondria

Marathon runners have a much higher percentage of "slow twitch" fibers in their muscles, which make it possible for them to run long distances at a
steady pace. On the other hand, sprinters' muscles are composed mostly of "fast twitch" fibers, which allow to allow for intense bursts of exertion.
Therefore, marathon runners have more
in their muscles to allow for greater
production in long
endurance runs.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.