An object is moving away from you while making a sound. What is perceived about the pitch of the sound?

It is perceived to be higher.

It is perceived to be fluctuating.

It is perceived to be lower.

It is perceived to be unchanged.

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude