Which of the following are cold-blooded (poikilothermic) animals?

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

Which one feature is common to leech,cockroach and scorpion?

Choose the correct pair:

Which of the following phyla possess an open circulatory system?
$(a)$ $Arthropoda$
$(b)$ $Annelida$
$(c)$ $Chordata$
$(d)$ $Mollusca$

$A$: Annelids,arthropods,and molluscs are protostomial coelomates.
$R$: All three phyla include members with bilateral symmetry and a true coelom.