Answer:
For about 4.5 million years, and still exist on earth
Explanation:
Humans are the most highly complex organisms and are comprised of well-developed brains. It shows advanced characteristics and is well developed social animals that can adapt well in any environment.
The humans are one of the major God's creation which has played and still playing a great role on earth.
These human beings were first appeared on earth about 4.5 million years back, during the time of Pliocene. These were the Hominoids and Australopithecus, from which they have evolved and became more advanced. They represent on earth since the Pliocene and still exist on earth.
Thus, it can be estimated that they are found to be present for about 4.5 million in the geological time scale and is the major and dominant species on earth now.
The answer is B I believe!
Lets say the plant that formed nodules is Species A, and the one who didn't is Species B.
If the nitrogen is concentrated in one area but at a low concentration, then Species A may have formed nodules because it is closer to the concentrated nitrogen. Species B didn't because the nitrogen that is active is being taken by Species A.
Answer:
Global warming is a change in the earth's climate which makes it heat up. While the greenhouse effect is a natural process that always is happening because of sunlight and the atmosphere.
I hope this is easy enough.
