Give one example of each:
$(a)$ Reptile which has a four-chambered heart.
$(b)$ Egg-laying mammal.
$(c)$ Parasitic Platyhelminthes.
$(d)$ Division among plants which has the simplest organisms.

(N/A) Crocodile: Most reptiles have a three-chambered heart,but the crocodile is an exception with a four-chambered heart.
$(b)$ Platypus: Also known as the duck-billed platypus,it is a monotreme that lays eggs instead of giving birth to live young.
$(c)$ Tapeworm: These are flatworms that live as parasites in the intestines of other animals.
$(d)$ Thallophyta: This division includes plants like algae that have a simple,undifferentiated body structure (thallus).