(Q).
Arubber band snapping causes the particles in the rubber band to vibrate, and by it's nature, a vibration is a frequency wave . Given these facts, what does a rubber band snapping cause among the following options: - frequency wave - friction - electrically - h2o - death - chemical reaction - elastic - Electrical energy
(A).
frequency wave

(Q).
Behaviors that improve fitness increase through natural selection, and natural selection is differential reproduction. Given these facts, behaviors that improve fitness increase through among the following options: - differential reproduction - produce offspring - biological diversity - metabolic reaction - recovery time from fatigue - characteristics - barks and snarls - members of their own species
(A).
differential reproduction

(Q).
Asandbar is formed by water moving sediment downstream, and some sediment comes from natural erosion. Given these facts, a sandbar is formed by among the following options: - loose soil - magma eruptions - wind currents - near the shoreline - seismic activity - natural erosion - flooding - Physical weathering
(A).
natural erosion