Hydrogen is a pure substance represented by the chemical symbol h. which of the following best describes hydrogen?
a. hydrogen is an element made of only one kind of atom.
b. hydrogen is a compound made of two or more kinds of atoms.
c. hydrogen is an element made of two or more kinds of atoms.
d. hydrogen is a compound made of only one kind of atom.
b

Which type of neuroglia is found outside of the brain?

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

Dna replication or repair occurs in a cell in all of thw following situations except when