A kelp forest is an ecosystem in itself. Many animals use these massive forests to shelter their young from predators. Other animals feed off of the kelp plants. When you understand how marine life lives with the kelp forests you can begin to understand the big picture.
Dimitri Mendeleev was the first to put elements together on a table. He knew there were elements missing but he noticed a trend in some of the elements known at the time. Sodium, Lithium and other alkali metals all have the same properties so he put them under the same column and created other columns with similar attributes (Halogens, Noble gases, Alkaline earth metals). Over the years, new elements were discovered and put into the rough outline that Mendeleev created.
I hope that is about what you wanted.
The answer for this question I think is D
1. c
2. a
3. b
4. f
5. f
6. f
7. t (i think)
8. t (i think)
9. The wood changed chemically from wood to ashes. It is a chemical change because it can not be brought back to original form. (You can't turn ashes to wood again)