They make interference waves
Answer:
Gravity
Explanation:
Gravity applies a constant downward force on the cars. The coaster tracks serve to channel this force — they control the way the coaster cars fall. If the tracks slope down, gravity pulls the front of the car toward the ground, so it accelerates
Electromagnetic waves carry sound
I am crossed between A and D but i think A is the correct one.
Answer:
A. sugar and phosphate groups
C. nitrogenous bases.