11. label each of the following as either a physical process or a chemical process.
a. corrosion of aluminum metal.
b. melting of ice.
c. pulverizing an aspirin.
d. digesting a candy bar.
e. explosion of nitroglycerin.
f. milk turning sour.
g. burning of paper.
h. forming of frost on a cold night.
i. bleaching of hair with hydrogen peroxide.
j. a copper wire is hammered flat.

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? the wings are analogous structures that evolved differently and do not have a similar internal structure. the wings are homologous structures that evolved differently and do not have a similar internal structure. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. wings of bats are vestigial structures, but the wing structures of birds are not vestigial.

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?

2. which is the last step in the scientific method?