Question 20 of 30
1 point
which of the following is the best definition of anaerobic respiration?
o
a. the cellular process that converts solar energy to chemical energy
when oxygen is not available
b. physical activity that increases heart and breathing rates
o
c. physical activity that decreases heart and breathing rates
o
d. the cellular process that releases energy by breaking down
glucose when oxygen is not available

the answer is d. matter from the air combined with the steel wool.

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.