During which period did t. rex reign? a) permian  b) triassicc) jurassicd) cretaceous

The largest internal organ in the frog is the

Why would the composition of a meteorite resemble the earth's interior?

Which example gives the relative location of a place? 50 main street 33 degrees n latitude, 91degrees w longitude east of the library 1600 pennsylvania ave., washington, d.c.