Answer:
A. They require a medium to travel through
Explanation:
The medium can be any substance-solid,liquid,or gas- and the wave's speed depends on the properties of the material of the medium the wave travels through.
Answer:
The First answer is C Digestion changes proteins into amino acids
And the secoud answer is D pancreas
Answer:
you could add an enzyme to speed up the reaction time and lower the amount of energy needed for the reaction
Answer:run over with ice to make sure hes okay
Explanation:
