Ihave trouble figuring out these questions

1. a metal ball has a mass of 2kg and a volume of 6m to the third power. what is its density?

2. a certain gas expands to fill a 3l container. its madd is measures to be 0.6 kg what is the density?

3. a solid is 5cm tall, 3 cm wide and 2 cm thick it has a mass of 129g. what is its density?

4. in terms of volume, how do ml and cm to the third power relate to one another?

5. a graduated cylinder is filled to an initial volume of 12.7 ml. a rock is dropped into the graduated cylinder. the final volume of the graduated cylinder is 18.2 ml what is the rocks volume?
what method was used to determine this?

When the earth was formed and cooled, why did nickel and iron end up in the center of the earth while basalt and granite ended up in the outer layers

Microtubular fibers that assist in the movement of chromosomes during nuclear division in conjunction with proteins, makes up the small and large organelle pieces that assemble prior to translation three-base nucleotide sequence that can complementarily pair with the functional transcript, allowing a particular material to be brought to a ribosome particular time in the cell cycle when the cell’s systems determine if the cellular conditions are appropriate to continue through the cycle time in the cell’s cycle when proteins are made and organelles are duplicated enzyme that allows proper nucleotide bonding during transcription specific dna sequence which will initiate gene transcription division of the cell’s cytoplasm specific bond that forms between two amino acids when a carboxyl group binds to a amino group three-base sequence that does not code for a particular amino acid a paired organelle which facilitates the formation of movement microtubules time in the cell’s cycle when the microtubular structures exert an equal pressure on the cell’s genetic material

How are isotopes of the same chemical element alike? how are they different?