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a small perch of India whose gills are modified to allow it to breathe air; has spiny pectoral fins that enable it to travel on land

a small perch of India whose gills are modified to allow it to breathe air; has spiny pectoral fins that enable it to travel on land

a small perch of India whose gills are modified to allow it to breathe air; has spiny pectoral fins that enable it to travel on land

United States physicist who invented the bubble chamber to study subatomic particles (born in 1926)

United States physicist who invented the bubble chamber to study subatomic particles (born in 1926)