When an object is approaching you while making a sound, the pitch of the sound is perceived
to be
fluctuating
unchanged
higher
lower

What are characteristics of minerals? select 3 choices

What is the ratio of carbon hydrogen and oxygen in a carbohydrate?

Which statement best explains the difference between weather and climate? the weather of an area is the same as its climate. the weather is the climate of an area over a period of time. the climate of an area depends on the weather. the climate is the weather patterns over a long period of time