- Life Sciences
breaking down of large nutrient molecules using chemical means (e.g. through the action of enzymes) into smaller soluble molecules that can be absorbed by the body.
the development of a distinct head, with a concentration of nervous tissue and sense receptors...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.