Question

this passage describes shell color in grove snails.
some grove snails have light - colored shells, and others have dark - colored shells. dark - colored shells absorb more light, so they heat up in the sun more easily than light - colored shells do.
snails are more likely to survive when they are not too hot or too cold. so, grove snails that live in shady places tend to have dark - colored shells, and grove snails that live in sunny places tend to have light - colored shells.
the table below describes a possible population of grove snails at the start of a period of time and at the end of that period. the table shows shell color in the population at each point in time.
complete the table. write the exact answers as whole numbers or decimals.
data about a population of grove snails

point in time	number with light - colored shells	number with dark - colored shells	percentage with light - colored shells	percentage with dark - colored shells
end	107	143	%	%

Explanation:

Step1: Calculate total start population

$28 + 222 = 250$

Step2: Find start light-shell percentage

$\frac{28}{250} \times 100 = 11.2\%$

Step3: Find start dark-shell percentage

$\frac{222}{250} \times 100 = 88.8\%$

Step4: Calculate total end population

$107 + 143 = 250$

Step5: Find end light-shell percentage

$\frac{107}{250} \times 100 = 42.8\%$

Step6: Find end dark-shell percentage

$\frac{143}{250} \times 100 = 57.2\%$

Answer:

Point in time	Number with light-colored shells	Number with dark-colored shells	Percentage with light-colored shells	Percentage with dark-colored shells
End	107	143	42.8%	57.2%