During which period of the Paleozoic Era did the first amphibians evolve?

Permian

Devonian

Cambrian

Carboniferous

What does a sled experience if it is dragged across the ground? A. kinetic friction B. static friction C. rolling friction D. cohesive friction

In which state of matter is there no particle motion A gas B liquid C plasma D solid E none of above

Work occurs when an applied force results in movement of an object in the same direction as the applied force. an object is subjected to balanced forces resulting in movement of the object.

Which factors improve soil fertility? select the three correct answers. A:nitrogen B:horizons C:manure D:humus E:bedrock

If you start with two sinusoidal waves of the same amplitude traveling in phase on a string and then somehow phase-shift one of them by 5.4 wavelengths, what type of interference will occur on the string?

Skeletal muscle cells have large stores of ATP that are readily available and alone can provide energy for maximal exercise lasting 30-60 seconds.

A catcher "gives" with a baseball when catching it. If the baseball exerts a force of 475 N on the glove such that the glove is displaced 8.97 cm, how much work is done by the ball? Answer in units of J.

Which of the following is the best sign that cooking pancake batter causes a chemical change

The electric field near the earth's surface has magnitude of about 150n/c. what is the acceleration experienced by an electron near the surface of the earth? express your answer to two significant figures and include the appropriate units.

Minerals are considered to be Answer made out of rocks the building blocks of rocks extremely rare and valuable difficult to find