PLEASE HELP Which does not occur during prophase
The nuclear membrane breaks down
Chromosomes can be seen for the first time.
Threads of spindle fibers are visible.
Doubled chromosomes separate to opposite ends of the cell.
All of the above.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.