A rock has a mass of 15 grams and a volume of 3 cm3. What is the density of the
rock?
HINT; The formula for density is:
density =
mass (g)
volume (cm)
A А
B
5 g/cm3
18 g/cm3
45 g/cm3

What must happen before a body cell can begin mitotic cell division

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space