In understanding the major causes of biodiversity loss, it's crucial to identify the key factors contributing to this global issue. Here are the explanations for the options:
- Over exploitation: This involves excessive use of natural resources, leading to depletion and harm to ecosystems, making it a major cause of biodiversity loss.
- Co-extinction: This occurs when the extinction of one species leads to the extinction of another, such as a host-specific insect with its host plant.
- Mutation: Genetic mutations are random changes in DNA that can lead to diversity but are not a direct cause of biodiversity loss.
- Habitat loss and fragmentation: Destruction and division of habitats reduce species populations and genetic diversity, directly impacting biodiversity.
- Migration: While migration itself is a natural biological process, when disrupted by human activities, it can indirectly affect biodiversity.
Thus, the major causes of biodiversity loss from the given options are:
- A. Over exploitation
- B. Co-extinction
- D. Habitat loss and fragmentation
Therefore, the correct choice is: A, B and D only.