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.
The central nervous system consists of two parts: the brain and the spinal cord. The brain is the center of our thoughts, the interpreter of our external environment, and the origin of control over body movement.
The organelle is golgi apparatus
Explanation:
the thickness of a muscle wala for left and right side of heart in different in size this is because the right side hasto pump the blood all over the body
Answer:
Yes.
Explanation:
Yes, they are necessary for photosynthesis.