Muscles work together in so that your body can move. As one muscle , the other relaxes. Muscles push; they always . When the muscles on the back of your upper leg contract, they and pull your lower leg back and up. When you straighten your leg, the muscles on the back of your upper leg and lengthen, and the muscles on the front of your upper leg .

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )