Describan los sistemas de circulación abierta y cerrada. Resalten Las Diferencias . . . Es des Ciencias Nat. mNesecito La Respuesta lo mas Rápido Posible . . . . .

Ithink the answer is d.

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass

The organism dies boomshakalaka

Lipid because of the high percentage of carbon to carbon bonds, which store more energy than other bonds.