If a velocity-time graph is horizontal, then acceleration is a
zero.
b
positive
С
less than 1.
d
none of the above

If the velocity-time graph is horizontal, the acceleration is zero because the slope will be zero.

b.transmitters send radio waves, and receivers capture radio waves.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d