A. biosphere

b. geosphere

c. atmosphere

d.
hydrosphere

Nucleic acid certain protein cell membranes certain carbohydrates

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

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%