True or false around 250 million year ago, all the continents were joined in one landmass, called cambria

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse