Phyla and related characteristics are given below. Choose an appropriate option which fills the blank spaces.

Phylum/Class	Excretory Organs	Circulation	Respiratory Organs
Arthropoda	A	Open	Tracheae
B	Metanephridia	Open	Gills
Amphibia	C	Closed	D

	A	B	C	D
1	Nephridia	Echinodermata	Metanephridia	Lungs
2	Malpighian tubules	Mollusca	Metanephridia	Book gills
3	Mollusca	Malpighian tubules	Metanephridia	Book gills
4	Malpighian tubules	Mollusca	Kidneys	Lungs

• A

  1

• B

  2

• C

  3

• D

  4