HELP URGENT!! 1. What are the three main stages of the cell cycle? Briefly describe the events that occur at each stage, -
2. Why must the DNA in a cell replicate before the cell divides? - Answer)
3. How does cytokinesis differ in plant and animal cells? - Answer)

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.

it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.