Do you think matter can enter or escape in an open system or a closed system? Is the fishbowl an open system or a closed system? Explain your reasoning. In what wants is Earth a system? Do you think its an open or closed system? Explain your reasoning.

What that person said is right

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

Dall of the above all of the choices make sense