Beach mice that live inland are usually darker in color than those that live on the sandy beaches along the coast. Which of these statements explains this color difference?

Usually, the sand (yellowish, light brown) is clearer than the normal land (dark brown). Now, is normal that the mice that have a better survival probability are those ones with a  colour similar to the environment in which they live. Those ones live for longer, and because of the natural selection, eventually, most of the population will have that color.

This is why the ones that live near the sand most likely are clearer than those that live near land.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂