Asecondary immune response differs from the primary immune response in that:
a. it is more rapid than the primary response and results in higher antibody levels.
b. it is slower than the primary response and doesn’t change the antibody levels.
c. it occurs at the same time as the primary response but results in a decrease in antibodies.
d. it only occurs in hyperallergic reactions and results in a decrease of antibodies.

Option A,  it is more rapid than the primary response and results in higher antibody levels.

Explanation:

When an antigen contacts the immunity system for the first time  it leads to a primary immune response. Since it is the first interaction, it requires more time   to produce effect.

While a secondary response occurs when the same antigen attacks the same person second , third or n number of times. During secondary response, the body already has a memory of primary immune response and thus it is faster.

Hence, option A is correct

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

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