To test the quality of water sources in her area, Shameka collects five samples from each water source and tests the quality of each sample. Which important step of scientific design is Shameka conducting? and do not say c cause it is not thank you please hurry

im not intirely sure but i think the anwser is d relative humidity

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers