Which of the following describes an independent variable a) the variable is an experiment that is manipulated by the scientist. b) the variable is an experiment that responds to the test variable. c) the variable in an experiment that is not allowed to change d) the variable is an experiment that is controlled for all groups

Option A would be correct. The independent variable is the part and/or variable of the experiment that changes. It is what the conductor of the experiment changes, in order to test out the Dependent Variable, (which is), the part of the experiment that does not change.  The dependent variable is the variable being tested and measured in a scientific experiment.

~Lauv

What’s the

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem