The origin of plants was a lengthy evolutionary process during which plants and animals de-scended from a common primitive ancestor. This occurred several billion years ago, even in the Archean eon. Chlorophyll gives plants their green color and they can feed on inorganic sub-stances. ...
Hemichordates are strictly marine benthic organisms. They are characterized by similar initial stages of embryonic development, the presence of a notochord (a dorsal outgrowth of the gut, also known as a stomochord), the unique structure of the secondary body cavity, and perforating budding. They first appeared in the early or middle Cambrian period. ...
