Which statement is true for the embryos of a salamander and a pig?
a) both lack limb buds.
b) both lack gill slits.
c) both have a notochord.
d) both have a shell breaker.

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.

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Why do electrons further from the nucleus have more energy