Some life forms move so slowly that their movement cannot be detected by normal observation. the best way to determine any movement is by placing a mark at some point, and observing any change in position from it. why is this true?

Which type of energy is transferred by convection currents?

An airplane is flying with a velocity of 240 m/s at an angle of 30.0∘ with the horizontal, as the drawing shows. when the altitude of the plane is 2.4km,a flare is released from the plane. the flare hits the target on the ground. what is the angle θ?

Suppose that the half-life of an element is 1000 years. how many half-lives will it take before one-eighth of the original sample remains? 8 125 12.5 3