Say please thank you when some one is talking say excuse me be nice
A standard contains a known amount of a substance. If u are performing an experiment you will use a sample with a known concentration to create a standard curve (a straight line). Positive and negative controls are measured against the standard curve to show the expected results if the sample u will be testing is positive or negative.
A healthy activity enchaging is biking to school
Answer:
"Nocking Point"
Explanation:
"A nocked arrow should be positioned about a quarter inch above the arrow rest on the bow handle. On most bows, a small brass band called a “nocking point” is crimped onto the bowstring to mark the correct position."
