How are proto-neurons thought to have evolved in early multicellular animals? a. through duplication of bacterial ion channel genes. b.through natural selection for increased speed of transmitting information. c.through mutation of bacteria ion channels. d.through horizontal gene transfer between early multicellular animals.

the answer is trees if i'm not mistaken

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.