What is a precursor? select one: a. a substance that is used to synthesize another compound b. a sign or symptom of a subclinical vitamin deficiency disorder c. a conditionally essential vitamin d. a substance that is recycled through the liver and intestines e. a sign or symptom of a clinical vitamin deficiency disorder?

Astudent completed a lab report. which correctly describes the difference between the "question" and "hypothesis' sections of her report? "question states what she is asking, and "hypothesis" states the result of her experiment "question" states what she is asking, and "hypothesis" states what she thinks the answer to that question is in 'if. then because" format. "question" describes what she is trying to find out, and "hypothesis" states the procedures and methods of data collection. "question" describes what she is trying to find out, and "hypothesis" states any additional information or prior knowledge about the question

There are only about 250,000 known fossil species. true or false

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture