Which geologic time did humans exist A) Cenazoic Era
B) Mesozoic Era
C) Palezoic Era
D) Precambrian Era

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

When a nucleus absorbs a neutron and then breaks apart, there are many products of the reaction. what is not a product of a nuclear fission reaction

Which element is the least metallic between cadmium, silver, zinc, or iron?