20points scientists use many scientific methods to answer their questions about the natural world. true false 10 points question 2 scientists ask questions based on the observations they hear about from others. true false 10 points question 3 an error in the preparation of a lab sample led alexander fleming to the discovery of the antibiotic penicillin. true false 10 points question 4 a hypothesis is an assumption about what will happen during an experiment or an observation. true false 10 points question 5 an experiment includes variables that are all kept constant. true false 10 points question 6 a well-designed experiment includes an experimental group and a control or baseline group. true false 10 points question 7 the variable group in an experiment gives you something to compare your experimental group to. true false 10 points question 8 to test their hypotheses, scientists perform carefully planned procedures called conclusions . true false 10 points question 9 sometimes, however, scientists have no choice but to conclude that they haven't answered their question. they might need to collect more data, restate their hypothesis, or design a different experiment. true false 10 points question 10 scientists communicate their findings so that others may restudy, improve, or expand them. true false