Which macromolecule gives the body the energy it needs to carry out cell functions

Answer;

-Carbohydrates

Explanation;

-Carbohydrates are made up of monosaccharides, and their polymers. The monosaccharides bond together to form polysaccharides, which are the polymers of carbohydrates. The most common monosaccharide is glucose, which is one of the most valuable sugars for all animals and plants.

-The function of carbohydrates is to act as an energy source for storage and structure for all living things. For plants, starch is the chief energy source and cellulose is what provides structure and support. For animals, glycogen supplies energy and chitin provides the structure and support.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

a time line cause it goes from 685 to 978