Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below.
Select one location to collect water samples in the pond.
Collect a 5-mL water sample at 8 am, 12 pm, and 6 pm for 10 days.
Measure the amount of pesticide present in each sample using different measurement tools.
After analyzing their data, the students conclude that pesticide runoff from farms is causing the fish to die in the pond. Which of these statements best describes why their conclusion is not valid? (2 points)
Different measuring tools are used to measure the water samples.
The pesticide measurements were the controlled variable.
The samples were collected for multiple days at the same times of day.
The time and day of sample collection was not an independent variable.
Answers: 3
Biology, 22.06.2019 01:30
Compare the composition of the moon's surface with the composition of the earth's surface.
Answers: 2
Biology, 22.06.2019 02:40
Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy ´ rryy? 
Answers: 1
Biology, 22.06.2019 05:00
Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis
Answers: 2
Two students completed an experiment to determine if pesticide use at local farms was causing fish k...
Geography, 14.10.2019 04:30
Biology, 14.10.2019 04:30
Mathematics, 14.10.2019 04:30
History, 14.10.2019 04:30
Chemistry, 14.10.2019 04:30
Mathematics, 14.10.2019 04:30
Biology, 14.10.2019 04:30
Mathematics, 14.10.2019 04:30
Mathematics, 14.10.2019 04:30
English, 14.10.2019 04:30