Answer:
Test a hypothesis
Explanation:
An experiment is done to test a hypothesis. An experiment can either prove or disprove a hypothesis. The experiment should be designed in a way that it can be repeated for validity to ensure that the results that come out of it holds true each time.
A hypothesis is made before the experiment is done. Developing data is done through interpretation of the results of an experiment. A conclusion is formed through analysis of the data obtained from an experiment.
<u>Answer</u>: B) White blood cells.
<u>Explanation</u>:
- <em>Killer T cells,</em> also known as cytotoxic T cells are the cells of the immune system. These are a type of white blood cells.
- These cells perform various functions such as killing the virus-infected cells, damaged cells, and cancerous cells. They are also involved in transplantation rejection as they recognize the MHC I molecules.
- However, since they are <em>themselves are a type of white blood cells, they do not kill them.</em>
I’m pretty sure it’s 100 or 150
<span>20 quadrillion cubic meters</span>
Answer:
When exercising your muscles need more oxygen. Therefore your heart needs to pump more blood (which carries oxygen) to your muscles.
