The student should make sure that the instrument she will be using to measure the pH of the water is valid.
Validity is concerned with an object's goal is able to measure the intended object.
<span> With this conclusion validity, our data gathered and presented are considered a reasonable one. It is the most important types of validity. As what is said, by having conclusion validity, your data will be undoubtedly least considered since it is labelled as statistical and well-studied. Once you already mention the word statistics meaning it is studied and surveyed with the most of the human race and includes relationship in your data.</span>
Answer: Atmospheric gases, especially carbon dioxide (CO2) and oxygen (O2), are extremely important for living organisms. Carbon dioxide and oxygen are the gases in the atmosphere that are needed for life. Plants need carbon dioxide for photosynthesis. They use sunlight to change carbon dioxide and water into food. The process releases oxygen
Explanation:
Hii ana ruba.....................
Answer:
Harry will take 21 seconds.
Explanation:
Speed of Harry = 
Since, Harry covers 12 miles in 6 minutes,
Then the speed of Harry = 
= 2 miles per minute
If he covers 0.7 miles then time taken by him will be,
Time taken = 
= 
= 0.35 minutes
≈ 0.35 × 60 seconds
= 21 seconds
