Read the scenario. Olivia is entering a competition to build a device that automatically feeds
fish every day. She has built a prototype and done multiple rounds of
testing and improvement. She thinks her design and the prototype are
where they should be.
Which option describes what Olivia is MOST likely to do next?
Select one:
Identify the criteria and constraints of her design,
Study existing automated fish feeders and compare her design to them.
Communicate her design and prototype to others.
Build a prototype of another design idea in order to compare the two,

answer; (b) clear with a slight blue tint;

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.