<span>1. Pose significant questions that can be investigated empirically.
2. Link research to relevant theory.
3. Use methods that permit direct investigation of the question.
4. The methods used to obtain data and test hypotheses should be benevolent and not malevolent.</span>
<span>In a nuclear fusion reaction, the mass of the products is less than the mass of the reactants. This "missing mass" -turns into energy.</span>
The answer is 3). Single-celled organisms, despite containing a single cell, need to live and thrive just as well as multicelled organisms. It would make sense for both to have structures to allow them to perform life processes
Answer:
Most fish use gills for gas exchange instead of lungs.
Explanation:
