Answer:
El sistema nervioso tiene dos partes principales: El sistema nervioso central está compuesto por el cerebro y la médula espinal. El sistema nervioso periférico está compuesto por todos los nervios que se ramifican desde la médula espinal y se extienden a todas las partes del cuerpo.
Answer:
becoming inflamed
Explanation:
antibodies fight against infections to protect the body
There are less trees and plants to absorb CO2 (carbon dioxide) and convert it to oxygen.
Answer:
Mammals evolved from a group of reptiles called the synapsids. These reptiles arose during the Pennsylvanian Period (310 to 275 million years ago). A branch of the synapsids called the therapsids appeared by the middle of the Permian Period (275 to 225 million years ago)
Explanation:
I tried:)
Answer:
Explanation: Amino acids are organic compounds that contain amino and carboxylate −CO−2 functional groups, along with a side chain specific to each amino acid. The elements present in every amino acid are carbon, hydrogen, oxygen, and nitrogen; in addition sulfur is present in the side chains of cysteine and methionine, and selenium in the less common amino acid selenocysteine. More than 500 naturally occurring amino acids are known to constitute monomer units of peptides, including proteins, as of 202
