1, and 2 are the answer and by one and 2 I mean the first 2 statements
That's the answer to the question
Answer:
An Experiment
Explanation:
To understand and explain the natural events, the scientific method is followed which refers to the systematic approach to understand the work. A scientific experiment is one of the step of the scientific method which is used to test the predicted statement which could explain the event.
The experiment includes the observations related to the predicted hypothesis and to answer the scientific question. The observation can produce facts which could prove or disprove the hypothesis.
Thus, an experiment is the correct answer.
Prevents bacteria from entering the blood
The stomach is the stretchy storage sac in the digestive tract.
