Joanna and Stephanie are researching the effects of global warming. They notice that several types of organisms, such as the armadillos, gnats and alligator are found much further north than they were found 20yrs ago. They concluded that the change of location of these species is directly related to global warming. What would you tell them about the validity of their conclusions? A - They made a valid conclusion

B - They should test their hypothesis before coming to that conclusion

C - Global warming could not cause species to move to different locations

D - They should research more species to see if others have moved further north over the last 20yrs

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.