Which is not an example of intracellular communication?

a.

ions are exchanged in a nerve cell stimulating other ion changes in that same cell.

b.

a chemical released in a cell stimulates another part of that same cell.

c.

a chemical release in a muscle cell causes the release of a second chemical in that same cell.

d.

a pheromone molecule in the air produced by one insect stimulates a reaction in a cell of another insect.

as many times as you want

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers