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Lyrx [107]
3 years ago
12

a light weight material is being tested effectiveness in blocking ultraviolet rays from the sun that cause skin to burn and poss

ibly develop skin cancer.which method would be most helpful for tezting this material?
Biology
2 answers:
Bas_tet [7]3 years ago
8 0
<span>Test the material in controlled natural settings by using natural UV light, and measure the UV light that passes through.</span>
Lynna [10]3 years ago
3 0
Exposing it to <span>ultraviolet rays and seeing the efectiveness</span>
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A graph of coal reserves in the United States versus time slopes downward. This indicates that coal production could have ______
rjkz [21]
The correct answer is:  [B]:  "decreased" .
________________________________________________________
<u>Note</u>:
________________________________________________________
        In a graph of "coal reserves in the United States" vs. "time" ; 

→ the "time" is the "independent variable" that belongs on the "x-axis" .

→ The quantity or amount of "coal reserves in the United States" is the "dependent variable" that belongs on the "y-axis" . 

       If the graph "slopes downward" ;  this would indicate a "decrease" in the amount/quantity of "coal reserves" over "time" .  

→  As the value of "x" increases — "time" increases — and; as "x" increases, the value of "y" {the amount/quantity of "coal reserves"} decreases.  

→ This would be represented by a "downward sloping" graph;  

→  and, among the answer choices given, could indicate that coal production:
_______________________________________________________
                     →  "decreased" ;    
_______________________________________________________
→  which is:  Answer choice:  [B]:  "decreased" .
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