When a new plant develops from a stem or root of its parent plant this is called what?

Leaf cuttings, in which a leaf is placed on moist soil. These have to develop both new stems and new roots.

Explanation:

Some leaves will produce one plant at the base of the leaf. In some species, multiple new plants can be produced at many places on one leaf, and these can be induced by cutting the leaf veins.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

geologic time scale (for gradpoint) =)