keys

Task 1:

1. Tiny
2. Investigate
3. Gulf
4. Biodiversity
5. Sample

Task 2:

1. 75%
2. By using modern devices
3. They can investigate the seabed  and bring samples of marine life back to the surface for further study
4. They provide a wide range of information, including water temperature, depth and the undersea pollution
5. Some of them live on or depend on the bottom like the starfish. Some are swimming animals such as fishes and sharks that move independently of water current while others are tiny organisms that are carried along by the currents like the jellyfish
6. Unless this biodiversity were maintained, marine life would be at stake.