I believe its is because the fossils of these animals looked like living species and they had a connection to the modern. A fossil is any preserved evidence of life from a past geological age, such as the impressions and remains of organisms embedded in stratified rocks. Fossils are created when organisms die, are in cased in dirt and rock, and are slowly replaced by minerals over time.
B, plants need to take on carbon dioxide and sunlight. They produce oxygen and glucose
<span>Proteins are made up of chains of small organic molecules called amino acids such as glycine, alanine, lysine or tryptophan.
Amino acids contain an amine functional group, which contains a
nitrogen atom, possibly one or two atoms of hydrogen, and a carboxylic
acid group, which has the formula -COOH.</span>