Which of the following represents a chemical change? Mowing of grass
Sublimation of ice
Dissolving sugar in water
Charring of a marshmallow

charring of a marshmallow

Explanation:

all the rest are physical changes

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.