4. a) What is the benefit of changes in food packaging technology, such as milk cartons? (2 points)

b) What has been one problem with this technology? (2 points

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun