(a) 1. To continue to get the products of human consumption.
2. Plays a major role in many ecosystem services that nature provides and that is invaluable.
3. Moral duty to pass on biological legacy in good order to future generations.
(b) 1. Habitat loss and fragmentation : large habitats when broken lead to loss of habitat for animals needing large territories (are badly affected) - population decline.
2. Over exploitation : leading to extinction of many, especially commercially important species.
3. Alien species invasion : alien species when introduced may turn invasive causing decline and extinction of indigenous species // explain with an example.
4. Coextinction : when one species become extinct, any other organism intimately associated also becomes extinct.
