Answer:
The correct answer is I think D
Explanation:
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Radioactive elements comprise a majority of the "ACTINIDES"
These are elements in the bottom row of the periodic table.
Essentially, a control variable is what is kept the same throughout the experiment, and it is not of primary concern in the experimental outcome. Any change in a control variable in an experiment would invalidate the correlation of dependent variables (DV) to the independent variable (IV), thus skewing the results.
Ore is the answer as is contains large amounts of useful elements
The answer is A The pancreas regulates blood glucose through hormones.
