Which of the following is a chemical reaction?

a.
breaking a glass pane
b.
freezing water
c.
digestion of food
d.
cutting down a tree
e.
evaporation of rubbing alcohol

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

If a grape were placed in a hypertonic solution what would happen and why?