Blood donations can be used to save lives for people suffering from blood loss due to traumatic injury. However, other times only certain components of the blood are needed. For example, platelets can be donated and used to help in cases where a clotting factor is missing in a patient. The fractioning of blood into its components is shown here. What experimental design was most likely used to provide evidence for the success in blood fractioning?

A) Blood donations were collected and separated by their different sizes.
B) Blood donations were collected and separated by the temperature at which they boil.
C) Blood donations were collected and separated by their attraction to a magnetic field.
D) Blood donations were collected and separated by their different densities in the mixture.

D

Explanation:

Blood bags collected from the donor and centrifuge the blood components are separated by their different densities in the mixture. As cellular components have a higher density they settled at the base of the blood bag while plasma has lower density it is at the top of the blood bag and clear in the texture. So, on the basis of density, blood components can be separated.

the correct answer would be 6 feet.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.