**urgent **
one challenge of tissue engineering is to ensure that the cells grow into the correct shape. to facilitate the growing of the cells, engineers use what?

a. biocompatible materials
b. nanotubes
c. the engineering process
d. scaffolds

Compare and contrast the bohr model and the electron cloud models of the atom.

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound