Which best describes the physical and chemical digestion of food? a) physical and chemical digestion occur in the mouth; only chemical digestion occurs in the small intestine. b) physical and chemical digestion occur in the small intestine; only chemical digestion occurs in the mouth. c) only physical digestion occurs in the stomach; chemical and physical digestion occur in the large intestine. d) only physical digestion occurs in the large intestine; physical and chemical digestion occur in the stomach.

A) Physical and chemical digestion occur in the mouth; only chemical digestion occurs in the small intestine.

Explanation:

Digestion is the biological process that occurs in the animals' bodies after or during their feeding. This process is important because it allows the nutrients and molecules that our body needs and are present in food to become assimilable and can contribute to the nutrition and health of our body. Digestion occurs through physical and chemical processes.

Physical digestion occurs in the mouth, through the grinding of food performed during chewing, however, chemical digestion also occurs in the mouth, due to the enzymes present in our saliva, which promotes the breakdown of some molecules.

Chemical digestion continues in the small intestine where nutrient assimilation occurs.

d i think its   answer d

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."