Plant fibers are primarily composed of which substance? * 1 point
Plastic Polymers
Keratin
Cellulose
Nucleic Acids

One of the purposes of transcription is to produce a sequence of bases that

Which of the following is true of metabolism in its entirety in all organisms? a) metabolism depends on a constant supply of energy from food. b) metabolism uses all of an organism's resources. c) metabolism consists of all the energy transformation reactions in an organism. d) metabolism manages the increase of entropy in an organism.

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d.higher