Why are beta-blockers being tested as a possible prevention for post traumatic stress disorder?

the answer would be d

not only is it colder, it also becomes darker, less salty, and more dense.

the question isn't complete here so i can't right an answer '_'

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.