B. most of the multicellular organisms that lived during the precambrian became
at the end of the precambrian.

the answer for apex is "1 and 6"

answer; hypnagogic sensations)

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called