Any substance that does not cause pollution and is capable of getting decomposed by any living organism is called as Bio degradable. Human & animal excreta, plant wastes etc... come under bio-degradable.
____________ scheme by the Central Government states that an insurance of 10 lakhs will cover each passenger traveling by Indian Rail while booking a ticket if an amount of 92paise is paid.
In animals like Annelids, Molluscs, organs have associated to form functional systems, each system concerned with a specific physiological function. This pattern is called ________ system level of organization.