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nadezda [96]
3 years ago
9

What percentage of US 12th graders have used marijuana in their lifetime? ​

Biology
1 answer:
Ymorist [56]3 years ago
7 0

Answer:

15.6%

Explanation:

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All matter whether solid, liquid, gas has a chemical formula or elemental symbol.
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Which hormone is the necessary trigger for ovulation to occur?
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Which characteristic differentiates amphibians from reptiles?
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Option D – amphibians may use their skin for gas exchange is the characteristic feature of amphibians that differs from reptiles.

Explanation:

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Amphibians have three-chambered heart. They do not develop amniotic eggs. Adult amphibians although spend much time on land, they breed only in water due to the absence of amniotic sac .

7 0
3 years ago
Action potentials in the heart spread from cell to cell through
Leni [432]

Answer:

Gap junctions within the intercalated disks

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3 years ago
Which best describes accuracy
aleksley [76]
Accuracy describes how well a measuring instrument determines the variable it is measuring. How close the value is to real value. The level of accuracy of measuring tool determines the detail to which it can measure. In order to be accurate in their work scientists need first select a measuring instrument that allows an appropriate measure of accuracy and then to calibrate it. Calibrating an instrument involves measuring already known quantities to check how accurately it is. In the laboratory accuracy of a test is determined when possible comparing results from the test in question with results geenrated from an established reference method.
6 0
3 years ago
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