On what basis have the following organs been classified?
Group I |
Group II |
stomach |
eye |
heart |
ears |
liver |
arms |
kidneys |
legs |
(a) organs of diegestive system and organs of nervous system
(b) internal and external organs
(c) organs producing hormones and organs that do not produce hormones
(d) organs that help in digestion and organs that help in movement