Before a hypothesis is made, a person must figure out a question in which is unanswered and involves envidence and reasearch to answer.
A physical change is when we teens get big you know what I mean???!!! and a chemical change is in our body, if you know what I mean. hope that helps.
Chlorophyll is a pigment found in the thylakoid membranes of the chloroplasts in the leaves. This is why plants are green. The simple answer is that plants are green because they have green chloroplasts.
