Answer:
1.2 million plants and animals
Explanation:
The living organisms have been grouped into two kingdom
a) Plants
b) Animal
Earth has enormous varieties of living species ranging from microscopic bacterias to huge animals like elephants, rhinoceros, from water plants and animals to terrestrial plants and animals , from autotrophic to heterotrophic organisms, from forest biome to desert biome etc.
In totality, there are 8.7 million species of plants and animals on earth. But till today only 1.2 million species have been identified and described.
Catalyst speeds up chemical reactions
Well, there are a lot of reasons that we are not clones of our parents. First, genetics get involved. Our parent's DNA mixes to make us a bit more random, with a combination of their DNA.
Secondly, environment actually plays a role in how we are different. Not wanting to get to complicated, but factors in the environment that our mothers were in can actually alter what genes are expressed!
A. cancer, cancer causes rapid cell division which results in tumors and the like.
"The plate tectonics theory suggests that the outer shell of the earth's surface is split into a few plates that move along the mantle, forming a hard shell, with pressure from mid-ocean ridges and subduction zones causing the shifting in the plates."
