Ibig sabihin ng responsable ay - pagkakaroon ng obligasyon na gawin ang isang bagay, o pagkakaroon ng kontrol o pangangalaga sa isang tao, bilang bahagi ng trabaho o tungkulin ng bawat tao
Navigable rivers and natural harbors was the geographic feature that contributed most to the settlement of colonies along the atlantic coast. The natural harbor is a body of water sheltered by natural barriers which is well deep to provide a good and a safe anchorage place which permit the transfer of cargo and passengers between the ships and the shore.
That's probably a landlocked country. They have little or no access to trade by ship, and air cargo is always the most expensive.
Small antennas on the spacecraft can beam weak radio signals back to earth meaning it can in some way communicate
