danielle's family is justifiably worried that her excessive use of a "downer" will lead to an accidental overdose and death. it further worries them that she often takes the drug with alcohol. which drug are they probably concerned about?

a. marijuana

b. amphetamine

c. phencyclidine

d. barbiturate

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.

Which of the following molecules can be broken down into simple sugars? a. nucleic acid b. protein c. lipid d. carbohydrate

How are fossils most commonly formed