Yes! Tough but smooth
Dolphins are covered in skin. See link for more.
The stratum corneum is the tough outer layer of the skin.
No they do not. Their skin is very smooth.
You could say The apple's skin was rather tough. The apple skin was rather tough is even better.
A tough waterproof skin.
This is a possessive - "The skin of the apple" so it goes "The apple's skin was rather tough" If there's more than one apple you'd say "The apples' skins were rather tough"
Land animals which have tough and dry skin are called reptiles:)
it is gray
Dolphins have blubber under their skin, that helps hold in their body heat.
yes it has tough skin
ItDriesUpp
cells of dolphins