1. 6 identical pieces of carrot were cut, weighed and put into placed in solutions of different concentrations of sugar solution. After an hour, they were removed, blotted dry and weighed again.
The change in mass was calculated. The results are shown below.
Distilled water 0.5M
1.OM
1.5M
Mass at start (8)
2.65
2.66
2.67
2.65
Mass at end (g)
2.92
2.85
2.35
1.89
a) What was the independent variable?
b) What was the dependent variable?
c) Suggest two variables that were kept the same
d) Explain why some pieces of carrot lost mass

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.