Enzymes 2) enzymes a) are composed of long chains of fatty acids. b) can be destroyed by variations in temperature or ph. c) are used up, in the process of performing a chemical reaction. d) raise the amount of energy required to start a chemical reaction.

The answer is B, can be destroyed by variations in the temperature.

Answer A is not correct because enzymes are made from protein, not fatty acids.

Answer C is not correct because enzymes are reusable, as their shape of the active site is not hanged by the reaction, thus having the ability to bind into other substrates again and again.

D is not correct because enzymes actually provide a pathway to start a reaction with a lower activation energy, therefore, it does not raise the amount of activation energy.

Answer B is correct because enzymes can be affected by temperature and pH, each type of enzyme only work the fastest at a specific temperature and pH, once the temperature is too high or he pH is too extreme, the active site of the enzyme is altered and thus cannot bind into substrates again. We can them denatured.

This is the most closely resembles the model. 

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.