The correct answer is D: Group 4.
A control group in an experiment is a group separated from the other groups, where the variable that is being tested cannot influence the results. In this case, different materials are the independent variable that you test. Effects of that independent variable on the melting rate of ice are excluded in the control group.
Answer:
the part which allows the pollen is the stigma
The invading bullfrogs ARE HARMFUL. This is because, they cause decline in the population of the native species.
Decline in the population of the native species will throw the ecosystem into a condition of imbalance which will eventually affect all the living organisms that are living in that ecosystem.
Answer:
nucleus is the top one
cell is the second
cell membrane is third
mitochondria is fourth
cell wall is fifth
chloroplasts is sixth
sorry if I'm wrong but I think that's what they are
