Question

The______is the largest and most successful phylum in the struggle for life 1)Arthropods , 2) Hemichordata, 3) mollosca , 4) Annelida
​

Answer 1

Answer:

Hemichordata.

Explanation:

The______is the largest and most successful phylum in the struggle for life 1)Arthropods , 2) Hemichordata, 3) mollosca , 4) Annelida

Answer 2

The (1) Arthropods is the largest and most successful phylum in the struggle for life.

Reason for thr success of Arthropods:

The presence of diverse mouthparts, appendages and the presence of chitinous exoskeleton makes arthropods the largest and most successful phylum.

Some other Phyla:

• Hemichordates: This phylum includes animals that are exclusively marine, worm-like and invertebrate. They have a structure similar to notochord called as stomochord. Example - Saccoglossus.
• Mollusca: After arthropods, this is the largest phylum.  These animals can be fresh water or marine. They have a special organ called Radula. Example - Loligo, Octopus.
• Annelida: This group includes animals with segmented body in the form of metamers. They can be marine or fresh water. Example - Earthworm, Leech.