Sort the examples based on whether they describe a physical change or a chemical reaction.
growth of a seed into
a seedling
tarnishing of silver
wax melting from
applied heat
making caramel by
burning sugar
grinding wheat to
make flour
adding copper with gold
to make jewelry
Physical Change
Chemical Reaction

growth of a seed=physical

tarnishing of silver=chemical

wax melting=physical

making caramel=chemical

grinding wheat=physical

adding copper=physical

Explanation:

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: