How does adding an iron bar to solenoid affect the magnetic field of the electromagnet

Most scientific questions are based on opinions. hypotheses. observations. experimental data.

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.

Ineed some everybody. the production of cells during mitosis into specialized function is called: recombination or differentiation