3) How are water molecules in a rain drop held together? A) attraction between positive charges B) attraction between negative charges O C) van der Waals forces O D) ionic bonds

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna