Coal is a basic source of chemical energy . Wood is also a source of chemical energy . Even there are more many sources like gasoline,photosynthesis
Two atoms of oxygen element are represented as "20". The two oxygen atoms are unreactive state and are unstable readily reacts and form molecules.
O₂ reprersents one molecule oxygen. When the two oxygen atoms reacts with each other forms one molecule of Oxygen. After the formation of Oxygen molecule, it (oxygen) has got stability.
I'm pretty sure that the cell membrane acts as the cell wall if you understand what I'm saying. The cell membrane will be the outermost structure.
False. I don't know how to explain it but they don't classify as living.
Answer:
when organisms produce more off spring than can survive is called overproduction