How do all $Platyhelminthes$ differ from $Aschelminthes$?

Which of the following fundamental features is common to $Balanoglossus$,$Anopheles$,and $Laccifer$ without any exception?

Which of the following characteristics are $NOT$ common to both Aves (birds) and Mammalia (mammals)?
$I$ - Homeothermic (warm-blooded) animals.
$II$ - Respire through lungs.
$III$ - Possess a four-chambered heart.
$IV$ - Dioecious (sexes are separate).
$V$ - Possess hair on the skin.
$VI$ - Show internal fertilization.
$VII$ - Possess teeth.

Write one example for each of the following in the space provided:
$(a)$ Cold-blooded animal.
$(b)$ Warm-blooded animal.
$(c)$ Animal possessing dry and cornified skin.
$(d)$ Dioecious animal.

Closed circulatory system is present in

In which of the following animal groups are all types of symmetry (asymmetry,radial symmetry,and bilateral symmetry) observed?