For his science project, Austin wants to determine if the pH of standing rainwater changes over time. He collects a jar of rainwater and places it indoors in a spot that does not receive a lot of sunlight to limit evaporation. Using a pH testing kit, he measures the pH of the water once a day for 20 days.
What is the independent, or manipulated, variable in Austin's experiment?
a. the number of days the rainwater is allowed to sit
b. the number of times the rainwater is observed
c. the change in the amount of rainwater due to evaporation
d. the change in pH of the rainwater over time
Answers (1)
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “For his science project, Austin wants to determine if the pH of standing rainwater changes over time. He collects a jar of rainwater and ...” in 📙 Biology if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers
You Might be Interested in
Within a firearm a burning material creates pressure to force the bullet or shot out of the barrel. what is this burning material?
Answers (1)
3. How does the cell use both DNA and RNA to direct protein synthesis?
Answers (1)
Protecting endangered animals is a different process because
Answers (1)
A science student makes the following statement: If cows produce more milk when fed wheat, then cows that were not fed wheat will produce less milk. What is the student doing? A. Drawing conclusions B. Forming a hypothesis C. Making a prediction D.
Answers (2)
Jake lives in the Northern Hemisphere. His cousin, Adriane, lives in the Southern Hemisphere. If it is March 20 (spring equinox) where Jake lives, which time of the year is it where Adriane lives? A. spring equinox B. fall equinox C.
Answers (2)
New Questions in Biology
How did Francesco Redi disprove the idea of spontaneous generation? He showed that flies were not produced by meat. He showed that microorganisms are present in air. He showed that microorganisms cause disease. He showed that flies spread disease.
Answers (2)
Of the millions of sperm who start the long journey to the egg, how many sperm are actually allowed to enter the egg?
Answers (1)
A mineral leaves a gray trail when scraped against an unglazed porcelain plate. Which property of a mineral is being measured? A. luster B. streak C. color D. hardness
Answers (2)
Which two systems in the human body are devoted exclusively to the regulation of organ function?
Answers (1)
A 40-year-old man reports to his health care provider complaining of "heartburn" that occurs after eating and also wakens him at night.
Answers (1)