They can use 3d printers to make identical copies of things such as fossils. The reason why that is useful is because REAL fossils are rare. So they can still study the traits and characteristics of the fossils without having to buy a fossil or find one because they are rare and they cost a lot
The propagation velocity of the waves depends on density and elasticity of the medium. Velocity tends to increase with depth and ranges from approximately 2 to 8 km/s in the Earth's crust up to 13 km/s in the deep mantle.
The region of the neuron containing the nucleus is ... primarily on the surface of the cell body and on the ... and most other cell organelles, ...
cell body answer is d
1 Nitrogen Fixing.
2 Decomposition and Ammonification.
3 Nitrification.
4 Denitrifying bacteria.
