Answer:
In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. ... An active sitecan catalyse a reaction repeatedly as residues are not altered at the end of the reaction (they may change during the reaction, but are regenerated by the end).
The difference is based mostly on density differences among rock materials.
Polysaccharide - a carbohydrate with molecules that have a number of sugar molecules bonded together
Disaccharide - sugar that is formed when two monosaccharides bond together
Monosaccharide - basic unit of carbohydrates; also known as simple sugars
Answer:
In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".