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?

repetition
replication
verification of results
using controlled variables

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.