How many items are present in the compound (NH4)2Cr2O7

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

The graph represents the distance a car travels over time while on the highway. which statement about the car's trip is accurate? a) the car does not move over time. b) the car travels at a constant velocity. c) the car's velocity increases constantly over time. d) the car's velocity decreases constantly over time.

Which branches of natural science include the study of an organism that lived 10 million years ago