One constant kept in this experiment is the amount of food available to the larvae.
Answer:
Guadalupe Peak
The Guadalupe Peak is a part of the Guadalupe Mountains, a mountain range in western Texas. It is the answer to this.
In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
Cells. when the cells die they fall off the tree.