Test: Click Reset. Click Advance year a couple times. Add as many bears to the forest as possible. Then go forward a couple more years. Select the DATA tab. Which populations were hurt by adding bears? The deer population wont be great,

Classify: Are bears producers or consumers? Explain your reasoning.

Draw conclusions: An organism that breaks down organic matter into simpler materials (like carbon dioxide) is called a decomposer. Decomposers absorb nutrients from living things or the organic matter they leave behind. They do not need to kill to get their food.

Do your results suggest bears are decomposers? Explain your reasoning.

Challenge: Using the Gizmo, figure out what bears prefer to eat most. Write your results and reasoning in the space below.

friedrich meischer discovered it in white blood cell

the right is separation by density .

take the blood which is a good example of a heterogeneous mixture.

blood is a vital liquid in our body, which transports oxygen from the air to our lungs so we can breathe. it is also used to eject wastes, such as carbon dioxide, to bring cells and molecules of the immune system to the tissues, and to spread hormones throughout the body. it corresponds to plasma, red blood cells, white blood cells, platelets and hemoglobins combined.

in medical tests centrifugal force is used to separate the different components of the blood.

in general, the centrifugation will allow to separate and analyze the different components of the blood, to know if the rate of white blood cells in the blood of a patient, for example, is normal, and therefore to know if his system immune is integrity.

under the action of centrifugal force, the solid components in the blood are drawn to the bottom of the tube in which the blood is contained. the centrifugal force then acts as an accelerated settling. it separates plasma from red blood cells and white blood cells.