All the options are correct.
1. New ways to preserve and transport blood for blood transfusions were discovered.
2. Blood transfusion safety was improved.
3. Scientists discovered that elements of blood could be separated by centrifuge.
4. Scientists discovered that plasma could be preserved by freezing.
Karl Landsteiner
Karl Landsteiner was the man who discovered some of the human blood types in 1900 and 1901 at the University of Vienna.
Answer:
A. They don’t share ancestors with other organism in the same grouping. Protists belong in a paraphyletic group
Answer:
The chemical transformation that occurs during nitrification is the conversion of ammonia into nitrites.
Explanation:
In the process of nitrification, nitrosomonas are the ones responsible to convert ammonia into nitrites and then they are converted to nitrates.
Answer: electron, proton, nucleus, atom
Explanation:
For questions four plants make their own food which is oxygen gas. This oxygen gas, is an important part of the air, the gas that plants and animals must live on. When people breathe, it is oxygen that we take out of the air to keep our cells and bodies alive.