What is the sudden appearance of a large array of animal life known as?

The correct answer to the question: What is the sudden appearance of a large array of animal life known as, would be, in fact, the Cambrian Explosion.

Explanation:

The Cambiran explosion is defined in Paleobiology precisely as a moment during the Paleozoic Era, when suddenly there was a massive appearance of animal species, and animal life, when before there hadn´t been such an event. Although none of the species from that time survived the biggest massive extinction event in the planet´s history, it still showed a jump towards what would be modern animal life.

essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.