Biology, 06.11.2019 21:31 dontap3037
Alice is performing an experiment to determine which mouthwash kills the most bacteria. she is testing three different mouthwashes. she uses four pieces of filter paper. each piece of filter paper was 3 cm in diameter. three of the pieces were soaked in each mouthwash for 3 minutes each. the fourth piece was soaked in plain water for 3 minutes as well. each piece of filter paper was placed on bacterial agar plate and covered. the agar plate was placed in a dark area and left alone for seven days. after the seven days was up, alice measured the diameter of the bacterial rings around each piece of filter paper.
the statement that best describes alice's experiment is:
a) the size of the filter paper is serving as a control.
b) the experiment should test only one type of mouthwash.
c) the experiment is well designed and has a valid control.
d) the experiment has too many variables that are being manipulated.
Answers: 2
Biology, 21.06.2019 18:30
What type of cell is produced after fertilization occurs and the gametes combines ?
Answers: 1
Biology, 22.06.2019 01:30
Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?
Answers: 2
Biology, 22.06.2019 15:00
Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources
Answers: 3
Alice is performing an experiment to determine which mouthwash kills the most bacteria. she is testi...
Biology, 03.09.2021 22:20
Mathematics, 03.09.2021 22:20
Mathematics, 03.09.2021 22:20
Mathematics, 03.09.2021 22:20
Mathematics, 03.09.2021 22:20
Mathematics, 03.09.2021 22:20
Mathematics, 03.09.2021 22:20
Computers and Technology, 03.09.2021 22:20
Mathematics, 03.09.2021 22:20
English, 03.09.2021 22:20