How big is the largest known asteroid diamiter

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

The transport tubes from food came down the plant are called?

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