The cambrian explosion resulted in the evolution of the first

Animals on Earth

Explanation:

The Cambrian explosion is referred to an event which took place in the past around 530 million years ago on the Earth.

Since the event took place in the Cambrian period of the geological time scale and lead to the evolution of the diverse forms of life or organism on Earth which looked like an explosion of the species on Earth, therefore, called the Cambrian explosion.

The Explosion took place due to the evolution of a new gas called the oxygen during this period by the green bacteria which led to the formation of the diversity of animals on Earth which could absorb the Oxygen.

Thus, the first animal on Earth is correct.

transformative rocks are the stones that emerge from the transformation of existing rock composes in a procedure called changeability, implies changing of structures. transformative rocks are shaped from alternate shakes that are changing a result of warmth or weight connected. one of this model is the earth developments that making rocks profoundly cover or crushed which will make the stones warmed and put under awesome weight. they are not softening but rather the minerals they are containing are changed synthetically that will shape transformative rocks. now and again different rocks are shaped when the others are near some liquid magma and getting warmed.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)