1/ The words in the box all appear in the passage. Fill in each blank with 1 of them. There are more words than needed: gulf, oversized, biodiversity, challenges, investigate, tiny, samples, provide There is only 1 ocean. It is divided into 5 different parts: the Pacific, Atlantic, Indian, Antarctic and Arctic Oceans. There are also many other smaller seas, gulfs and bays which form part of them. Altogether they cover 75 percent of the earth's surface. For centuries, people have been challenged by the mysteries that lie beneath the ocean. However, today's scientists have overcome many of the challenges of the depth by using modern devices. They send submarines to investigate the seabed and bring samples of marine life back to the surface for further study. Satellite photographs provide a wide range of information, including water temperature, depth and the undersea populations. If modem technology did not exist, we would never have such precious information. Marine plants and animals fall into 3 major groups. 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 currents while others are tiny organisms that are carried along by the currents like the jellyfish. Plants and animals of the sea, however small or oversized, all contribute to its biodiversity. Unless this biodiversity were maintained, marine life would be at stake. 1. Some plants and animals are referred to as___________organisms because they are extremely small. 2. Thanks to modern technology, scientists have been able to___________the life of plants and animals that live under the sea. 3. A__________is a large area of sea that is partly surrounded by land. 4.___________is a term that refers to the existence of different kinds of animals and plants which make a balanced environment. 5. These scientists have collected different___________to analyse for their experiment.