First episode release date was <span>February 27, 2012</span>
Two key characteristics of a good scientific investigation are hypothesis and observation of whatever organism your studying.
Answer:
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.
Explanation:
<span>D.water and carbon dioxide</span>