Q.Fill up the blank spaces appropriately Table — Phylum/Class | Excretory Organ | Circulatory Organ | Respiratory Organ:
Arthropoda | ? | ? | Lungs/Gills/Tracheal System
? | Nephridia | Closed | Skin/parapodia
? | Metanephridia | Open | ?
Amphibia | ? | Closed | Lung

Filled table:

• Arthropoda — Excretory: Malpighian tubules; Circulatory: Open; Respiratory: Lungs/Gills/Tracheal system (given).
• Annelida — Excretory: Nephridia (given); Circulatory: Closed (given); Respiratory: Skin/parapodia (given).
• Mollusca — Excretory: Metanephridia (given); Circulatory: Open (given); Respiratory: Gills. …

Each row of organ systems corresponds to a specific phylum or class described in the classification scheme.

• Arthropoda: excretion takes place through malpighian tubules, and the circulatory system is of the open type, with blood not fully enclosed in vessels — matching the given respiratory entry of lungs/gills/tracheal system, which varies by arthropod group.
• Annelida (the phylum for the second row): nephridia carry out osmoregulation and excretion, the circulatory system is closed, and respiration occurs through the skin or, in aquatic forms like Nereis, through parapodia — all matching the given entries. …

Method: Row-consistency cross-check using the given entries

Rather than recalling each missing cell independently, use the entries the table ALREADY gives in each row as clues, and deduce the missing phylum/class name (or organ) from what must be consistent with those given entries — filling blanks by cross-checking, not by guessing the phylum from scratch.

Row 1 (Arthropoda given; excretory and circulatory organs blank). The respiratory entry already given — "Lungs/Gills/Tracheal System" — is itself a strong Arthropoda signature (this varied, group-dependent respiration matches insects, crustaceans and arachnids differently). Cross-checking against what is known specifically about Arthropoda's OTHER organ systems: their excretion is via malpighian tubules, and their circulation is of the open type (blood floods the tissues directly, consistent with a hard-exoskeleton body plan that doesn't need a fully closed vessel network). Both blanks are filled by what is independently known about Arthropoda as a whole, cross-checked against the already-given respiratory clue.

Row 2 (Nephridia and Closed given, respiratory given as Skin/parapodia; phylum name blank). The two given organ facts — nephridia for excretion, closed circulation — together with skin/parapodial respiration point specifically to Annelida, since nephridia are the annelid-specific excretory structure and parapodia are explicitly an annelid (aquatic) feature; no other phylum's row would combine all three givens this way. …