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.
You could talk about a Salamander.
Salamanders are anphibians just like frogs, and they have many of the same characteristics.
Hope I helped! Good Luck in this assignment! :)
Sore muscles during vigorous exercise
Answer:
C tiene sentindo
Esperemos que sea correcta
Molecule
cell tissue
organ
organ system
organism
population
community
ecosystem
biosphere.
Hope this helps!