1) closed circulation
2) The spleen can easily be damaged if someone suffers a sever injury to the stomach. When the spleen is damaged, it can cause pain in the abdomen, dizziness, and pain in the left shoulder.
Answer:
There are 4 methods by which you can increase the rate of a reaction:
Explanation:
Increase the concentration of a reactant.
Increase the temperature of the reactants.
Increase the surface area of a reactant.
Add a catalyst to the reaction.
