Why is heartwood darker in color than sapwood

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids

The first amino acid of a new polypeptide chain is

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks