Stomach contracting to mix foods with enzymes
Answer:
Bubbles are a sign that the yeast is alive, and that it is performing anaerobic respiration. You should notice that the mixtures with too little and too much sugar do not grow, bubble or foam properly. This is because the yeast needs the perfect amount in order to produce carbon dioxide.
Explanation:
A Scientific Hypothesis Must Be "Falsifiable". A scientific hypothesis must be testable, but there is a much stronger requirement that a testable hypothesis must meet before it can really be considered scientific
Answer:
A, the populations of producers and decomposers should be stable
Explanation:
The other three do not fit, only reasonable one is A
