The predominant hypothesis for why the animals needed some 3 billion years to evolve after the life first appeared on the planet is that the conditions were not right for them to appear.
The life on Earth has appeared much earlier that what we normally assume, and also it has not been evolving very quickly, but instead it has been a very slow and gradual process. The reason for that is that the living conditions on the Earth were much different than what are they now, or anytime from the Cambrian period until the present.
The surface was still pretty hot, and there was intense volcanic activity. The composition of the atmosphere was not suitable for animals to appear at all, and in fact it would have been toxic for them. The water too had chemicals in it that were not providing the right conditions for animals to evolve. It was only after the plants started to appear and managed to make lot of changes in the water, atmosphere, and land, than the animals were able to evolve and develop.
Earthquake, Tsunami, land slides, storms, and flooding
Answer:
Should be to store the genetic information ans control center of the cell
Answer:
A. Humans have different-colored hair.
Explanation:
Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species, it ranges widely from the number of species to differences within species and can be attributed to the span of survival for a species.
Answer:
B. extensive gene flow
Explanation:
When two populations are separated by a physical barrier, such as a desert, canyon, sea, mountain range or forest, they are being isolated extrinsically, or by external means. They physically cannot meet each other, so there is no chance of genes being passed between them.
