1. Some international organisations include:
- United Nations (UN)
- World Health Organization (WHO)
- International Monetary Fund (IMF)
- World Bank
- Amnesty International
- Greenpeace

2.
- Yes, the UN is an international organisation.
- The UN stands for United Nations.
- Yes, UNICEF is an international organisation.
- UNICEF stands for United Nations International Children's Emergency Fund.

3. This is a personal preference question, but some possible reasons for preferring online learning could include flexibility, convenience, and the ability to learn at your own pace. Face-to-face learning, on the other hand, allows for more interaction with teachers and classmates, which some people may find more engaging and effective.

4. Some benefits of blended learning include:
- Flexibility in learning
- Personalized learning experience
- Increased engagement and motivation
- Access to a variety of resources and learning methods

5. Some environmental problems include:
- Climate change
- Deforestation
- Pollution (air, water, soil)
- Loss of biodiversity
- Ozone depletion

6. The most effective way to save endangered animals is through a combination of conservation efforts, habitat protection, anti-poaching measures, and public awareness campaigns. Additionally, supporting organizations and initiatives that work towards protecting endangered species can also make a significant impact.