What is one way to describe elements? A. They break down easily.

B. They are the most expensive materials on earth.

C. They are the building blocks of matter.

D. They are the smallest particles of any material.

Hope this helps!

for k12

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.