Scientists think that our four legged mammals might be the distant ancestors of modern-day whales what evidence seems to support their idea?
a.)animals with similar embryo development
b.)dna evidence
c.)migration patterns
d.)a series of closely related fossils

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

The receptor cells that convert light energy into neural signals are called

What caused magnetic fields? what happens if you keep breaking a magnet in two until you reach a single atom?