The chemical structure below represents a . carbohydrate
nucleic acid
lipid
protein

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

In the practice of science, this type of reasoning is used to develop explanations.

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade