21 In an ideal world, an object moves at a constant speed.
What will happen to this object's motion over time if no new forces are applied?
It will change direction
B It will increase in speed
It will decrease in speed
D) It will maintain a constant speed

d.) greenhouse gases

all fossil fuels are nonrenewable, so think coal, gasoline, things that we will eventually run out of. all fossil fuels are nonrenewable resources, but not all nonrenewable recourses are fossil fuels. these resources are not being renewed as fast as we are using them. i hope this considering there weren't any answer choices.