What describes only a physical change during digestion? Answers)
A: Hydrochloric acid in the stomach breaks down proteins
B: Chewing in the mouth breaks food into smaller pieces.
C: Enzymes in saliva start the digestion of starches before food is swallowed
D: Bacteria in the intestines convert dietary fiber into fats.

What element breaks down into yttrium-90?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Which of the following is not a characteristic of s waves?