Answer:
the answer is D) a negative charge
The experiment must maintain internal and external validity, or the results will be useless. When designing an experiment, a researcher must follow all of the steps of the scientific method, from making sure that the hypothesis is valid and testable, to using controls and statistical tests
Heliotropism is the process that describes how a plant specifically tracks the sun's movement across the sky.
Answer:
The answer to the question is D