How many chemical changes occurred in this scenario?
Justin is making a snack. He toasts a piece of bread and
spreads peanut butter and jelly on it. Then he cuts an apple
into several slices and adds these to his plate. Next, Justin
mixes a scoop of lemonade powder into a glass of water,
mixes it, and adds ice.
two
three
four

Which gas found in the earth's atmosphere greatly impacts the daily range of temperature on earth. a) oxygen b) hydrogen c) nitrogen d) water vapor

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs

One of the reasons that stars are so large is because