How do governments and NGOs assist in economic development?

Answer the above statement is correct (true);

The correct answer is:   [b]:   "physical systems" .

This is a true statement  hope this : )

Each meridian forms half of a great circle, assuming a spherical earth. meridians intersect lines of latitude (parallels) at right angles. the spherical earth is divided into  360 degrees   east-west. lines of longitude range from 0° to  180° to the east and from 0° to -180 ° to the west of the prime meridian.