You have to divide the four living things into three groups. First, you divide them into two groups: shell or no shell. That puts #1 in a group by itself. What property would you MOST LIKELY use to divide the others into two smaller groups?

A) body size
B) body shape
C) tail or no tail
D) legs or no legs

a. by using fur or clothes to trap heat energy near the body

i believe it is c: genes for body color and wing size are inherited separately from each parent.

d. groundwater flows through the subsoil and deposits minerals.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.