The best example of a boundary is . A.
a river that divides two countries
B.
an underground tunnel
C.
an open space of land with mountains and rivers
D.
a defined territory with an established government

Please select the best answer from the choices provided

A
B
C
D

What is likely to happen in the long term if the earth continues to absorb more energy than it emits? a. the earth will discontinue recycling energy. b. organisms will begin to compensate for the change by incorporating more energy. c. the overall temperature of the earth will increase. d. the nutrient cycles will happen more frequently. select the best answer from the choices provided a b c d