Which two pieces of equipment did the geologist most likely use to determine the density of the copper nuggets?

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?

All annelids and arthropods have a blank body plan . unlike annelids, arthropods also have blank . the circulatory system of annelids is blank , while circulatory system of arthropods is blank .