Concept:Biodiversity loss is driven by habitat destruction, over-exploitation, and invasive species.
Key Fact:Habitat loss occurs when natural areas like the Amazon rainforest are cleared for agriculture such as soyabeans.
Over-exploitation by humans caused the extinction of species like Steller's sea cow and passenger pigeon.
Water hyacinth is a notorious invasive species that disrupts aquatic ecosystems.
Explanation:Statement A is correct: clearing rainforest for soyabean cultivation is a direct example of habitat loss.
Statement B is correct: Steller's sea cow and passenger pigeon were driven to extinction by over-hunting and over-exploitation.
Statement C is incorrect: the introduction of Nile perch into Lake Victoria led to the decline, not growth, of cichlid fish populations.
Statement D is correct: water hyacinth is an invasive species that outcompetes native plants.
Statement E is incorrect: extinction of one species often affects other species that depend on it, causing cascading effects.
Answer:Thus, the correct statements are A, B and D only, corresponding to option B.
