."Reptiles: cold blooded animals that creep or crawl along the ground whose skin is covered by horny plates or fish-like scales (eg: snakes, lizards, crocodiles and turtles). The majority lay eggs, but some give birth to live young"
Two questions need resolving.
1) Why did the author use whose skin is here? Isn't skin a countable word? In Oxford, they said that: Skin 1)[U, C] the layer of tissue that covers the body:
to have dark / fair / olive, etc. skin « The snake sheds its skin once a year. « cosmetics for sensitive skins « skin cancer
I cannot understand when it becomes an uncountable noun and when is not.
Skins is used when there are multiple skins - for instance: The Muscovy trade in sable skins was enormous.
In the sentence above, "skin" is generic to all reptiles, all of which have skins.
2) What do they mean by live young in the last line? The offspring of the reptiles concerned are not hatched from eggs, but as with mammals are delivered alive from the female body.
3) Is the term by nature equal to naturally?
ex: Mariam is bright by nature
Mariam is bright naturally?
Not quite. "By nature" means a person's character, while "naturally" means have born with a characteristic.
Student or Learner