The answer should be D) Behavioral.
Process of elimination, cant be A) X- ray cause that for screen shots on what is inside u, autism is a mental disorder, u cant see it.
Cant be B) cause u cant detect mental disorders through a blood test.
Cant be C) cause that is measuring weight and height.
Constants are factors that are not changed in the experiment. Since the experiment is testing different colors of light on plant growth, light color is being changed, and is therefore not a constant. Hope this helps! :)
20 is the Number of Neutrons of potassium.
The nutrients get to the cells in a flatworms solid acoelomate body by diffusion process. Flatworms feed primarily on protozoa and bacteria, smaller worms and tiny organisms, dead or alive, that they come across. Based on the species of the flatworms , they also consume plant materials. They rely on diffusion to transport oxygen and nutrients to their internal tissues.
