Explain name five ways that organisms
can be preserved as fossils, and explain what
fossils can show about earth's history.

1) preservation

2.)complete replacement by a mineral

3.) filling in of a hollow space by a mineral

4.)formation of a thin film of carbon

5.)formation of an imprint or the filling in of an imprint

Fossils show what our first common ancestor was and they preserve what was left behind of them. Some examples could be like the first man's bones and inventions. Also, amber can help preserve insects and other things.

1) they can be Preserved

2) they can complete replacement by certain minerals

3) and their formation of an imprint or the filling in of an imprint

4) their formation of a thin film of carbon

5)They fill empty spaces by a mineral

Things that fossils can show about earths history is when the certain animal started to exist, and their time frame, it also tells when the earth may have first been 'born' because animals couldn't exist on earth before the earth did.

You know what I mean?

the answer is:

carbon dioxide

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.