An embryonic stem cell is the first cell in the embryo, this is what creates a human and helps more cells to form.
Lead.
"Due to insufficient water treatment, lead leached from water pipes into the drinking water, exposing over 100,000 residents to elevated lead levels."
A Microorganism which can also be known as a Microbe or Microscopic organism
Answer:
The scientific method
Explanation:
1. Observation
2. Ask a question
3. Form hypothesis
4. Make a prediction of hypothesis
5. Test Prediction
6. Iterate: make new hypothesis or problems with found results.