Question

compare between arthropoda and mollusca

Answer 1

arthropods:-

have jointed limbs

hard firm external skeleton

segmented bodies ( head thorax, abdomen

molluscs:-

soft bodies with no segments

muscular foot or tentacles

internal or external shell

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Answer 2

$Here \: is \: the \: answer \: of \: your \: question$

`$\textbf{Arthropoda}$`

→ It is the first largest phylum of kingdom animalia.

→ They have organ level of organization system.

→ They have bilateral symmetry and are Triploblastic animals.

a) Bilateral symmetry :- The body can be divided into two equal similar halves by a single plane.

b) Triploblastic animals :- In which three layers namely endoderm, ectoderm and mesoderm are present.

→ Body is divided into head, thorax and abdomen.

→ They mainly Respire through body surface, trachea and gills.

→ Segments are present in them.

→ Appendages are jointed feet.

→ Found mainly in marine, fresh water and terrestrial.

→ Ex :- crabs, prawns, spiders etc.

`$\textbf{Mollusca}$`

→ It is the second largest phylum of kingdom animalia.

→ They have organ system level of organization.

→ They have bilateral symmetry and are Triploblastic animals.

→ Body is divided into muscular foot, head and hump.

→ Respire through gills.

→ They are usually unsegmented.

→ Foot are present to act as appendages.

→ They are terrestrial and aquatic animals.

→ Ex :- snails, cuttlefish, oyster etc.