سؤال قراءة ستيب محلول — الإشارة والمرجعية (تدريب 6155)

(1) One type of threat to the ecosystem is endangering an animal species through overhunting, thus killing them faster than t ey can reproduce. Some species now are endangered because of the large profits in the trade of luxury goods made from materials they provide. For example, elephants are a prime source for ivory. The trade in goods obtained by killing animals in danger of extinction is estimated at a minimum of five billion dollars annually. (2) There is an incredible link that exists between all living and nonliving things. Thus, although at first it is surprising, the poisoning or deliberate extermination of animals classified as pests or predators may endanger animals further down the food chain. Likewise, bringing in animals not native to a local habitat may upset the ecosystem. The pronoun they in Paragraph (1) refers to ……………