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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

reflex changes in the eyes that enable an object to be focused on the retina

reflex changes in the eyes that enable an object to be focused on the retina