Which complex carbohydrate has 3 to 10 simple sugar units and cannot be broken down by the body's digestive enzymes

Nucleic acid certain protein cell membranes certain carbohydrates

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?