Question

The two more distantly related phyla are
(a)Cnidarians and Platyhelminthes
(b)Annelida and Arthropoda
(c)Chordata and Echinodermata
(d)Mollusca and Echinodermata

Answer 1

Hint: They both are comparatively small invertebrate animals with strong and obvious body segmentation, circulatory systems and a one-way gut.

Complete answer:
Annelida and Arthropoda are the two more distantly related phyla. Though they both are triploblastic and have bilateral symmetry animals. They are distantly related as –

Annelida	Arthropoda
Metameric segmentation is observed where the body is segmented, from head to tail.	Incomplete metameric segmentation, the body is not completely segmented.
The circulatory system of annelids is closed.	Arthropods have an open circulatory system.
They are referred to as segmented worms.	They are termed as animals with jointed legs.
Coelom is the true body cavity they possess.	Presence of the body cavity containing blood known as ‘haemocoel’.
Breathing takes place through the skin.	Breathing takes place through the trachea, gill, book lungs etc.
Most of the annelids are hermaphrodites.	They have separate sexes.
Example – Nereis, Earthworm and Leech	Example – Housefly, crab and Scorpion

Additional Information:
Excretion is done by various organs such as malpighian tubules and green lands in arthropods whereas in annelids have organs called nephridia for excretion.
The nervous system of annelids consists of paired ganglia (collections of nerve cell bodies) and a double ventral nerve cord connected by lateral nerves. In Arthropods sense organs like compound eyes and statocysts are present
So, the correct answer is 'Annelida and Arthropoda'.

Note: Among all the phyla of the Animal kingdom, Arthropoda is the largest animal phyla. Since annelids are soft-bodied, their fossils are rare. Arthropods present to human food contribute both directly as food, and more significantly indirectly as pollinators of crops. Some species are known to outspread severe disease to humans, livestock, and crops.