Which of the following is true about homogeneous mixtures? a. they are known as solutions
b. they consist of two or more phases
c. they have compositions that never vary
d. they are always liquids

Option (A) is the correct answer.

Explanation:

A homogeneous mixture is defined as the mixture in which solute particles are evenly distributed in a solvent.

A homogeneous mixture is a clear solution.

For example, salt dissolved in water is a homogeneous mixture.

A homogeneous mixture is also known as solution as a homogeneous mixture is basically a clear solution.

Composition of the solute and solvent particles can vary with time or set of conditions.

A homogeneous mixture can be present any state.

Thus, we can conclude that the statement they are known as solutions is true about homogeneous mixtures.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest

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.