Easy. Because the tilt of the earth, and because the of the distance the earth is from the sun, either more light hits the earth, or less light hits it. This becomes the basis for winter and summer solstices. This also becomes the reason why the seasons change (as the ecosystem begins to accommodate to the changes in energy disposition)
They are saying that every theory can eventually be changed a bit due to further research. It does not mean the theory is bad, just that it can become better.
nahh .. it's okay ..
to be honest, I wanna answer but hmm .. I don't ..
Answer:
D. A base substitution in gametes during meiosis
Explanation:
There is not any nucleus and nuclear bound organelles in prokaryotes....
