13-13= 0, 19-13= 6, so then 0-6= -6
There are inner part of the stem and outer part of the stem; in a plant the inner part supports the movement of the water and nutrients. You stop the flow of the vital elements of plant growth when you snap the stem and this is the reason why the plant die due to starvation of the nutrients.
Decomposition reaction occurs when chlorophyll breaks down to form new substances.
<span>in the troposphere (the lower part of the atmosphere).</span>
Look out side in the morning you see fog that is a chemical reaction