For an observer who stays in one spot when the source of a sound is moving, the sound wave's: A. Amplitude decreases
B. Speed increases
C. Amplitude increases
D. Frequency changes

What happens to the average kinetic energy of a gas when the particles of the gas collide against each other at a constant temperature and volume? explain your answer.

Amixture with the same composition throughout is!

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum