Answer:
D. Look for scientific research about whether these claims are correct or not.
Explanation:
Being a Scientific question, the question should be based more on your ability to find out if the jewelry is made of real material (or the material they claim they used). This can be found by finding their sources of material, and checking professional reviews.
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Type of chocolate bar, size of it, surface it is placed on, etc
Controlled variables are anything that stay the same for both trials
A population decrease in primary producers would affect the ecosystem negatively because everyone who ate the primary consumers would have a lack of food.
Answer:
<h2>
Vacuoles</h2>
Explanation:
Vacuoles (located in the cell), store water, food and waste. It acts as a storage unit for the cell.
