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Answer:
they have different witnesses
Explanation:
The sources of evidence have the different witnesses attached to them. The primary source of evidence is to prove a case in the court of law. In other words, the source of the evidence is to make sure that there is sufficient information to build a case. Thus, the evidence can come in many forms - the physical, the document, the demonstrative, and the testimony. However, the physical evidence is the most reliable form. In an unchanged state, the physical evidence, like DNA is very reliable.
Answer:
The heart pumps blood through the lungs. In the lungs the blood receives oxygen and releases carbon dioxide. Then the heart pumps this oxygen-rich blood from the lungs to your cells. When the oxygen-rich blood gets to the cells, the cells receive the oxygen and release the carbon dioxide.
The cells in our bodies need oxygen to stay alive. Carbon dioxide is made in our bodies as cells do their jobs. The lungs and respiratory system allow oxygen in the air to be taken into the body, while also letting the body get rid of carbon dioxide in the air breathed out.
Explanation:
Hopefully this helps :)
A control is the normal behavior you are testing the variable against. There are two types of variables. The independent variable is what you change to test what the dependent variable is, which is the variable that changes due to the independent variable, and what you generally record your data over.
