Answer:
convergent boundary
Explanation:
brother said but correct us if wrong
A because it is the only correct one
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.
The role played by the spindle during mitosis is to bring about an orderly distribution of chromosomes to the daughter cell.
The spindle fibers form a protein structure that divides the genetic material in a cell. They are necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: in both mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.
