The sea and the sky appear blue because of a phenomenon called Rayleigh scattering, where the shorter blue wavelengths of light are scattered more than the other colors by the gases and particles in the Earth's atmosphere. This scattering causes the blue light to be more visible, giving the sky and the sea their blue appearance. As for plants, they appear green because of the pigment chlorophyll, which is used in the process of photosynthesis to capture light energy. Chlorophyll absorbs red and blue light, but reflects green light, giving plants their green color. **

The yellow-green color of the inside of a sea bream is likely due to the presence of bile pigments. Bile is a digestive fluid produced by the liver and stored in the gallbladder, which helps in the breakdown and absorption of fats in the digestive system. The yellow-green coloration indicates the presence of bile in the fish's digestive tract, which is a normal part of its digestive process. **

The North Sea, Baltic Sea, and Mediterranean Sea are all partially enclosed bodies of water, while the open sea refers to the vast expanse of ocean that is not enclosed by land. The North Sea and Baltic Sea are located in northern Europe and are partially enclosed by surrounding countries, while the Mediterranean Sea is connected to the Atlantic Ocean but is largely enclosed by land. The open sea, on the other hand, refers to the unrestricted ocean waters that are not enclosed by land. **

Shallow marine areas are better explored than the deep sea because they are more accessible to researchers and technology. The shallow marine areas are closer to the surface, making it easier for scientists to reach and study them. Additionally, the shallow marine areas are more well-known and have been studied for a longer period of time, leading to more available data and research. In contrast, the deep sea is much more challenging to explore due to its extreme depths, high pressure, and darkness, making it more difficult and expensive to conduct research in these areas. **

The Atlantic Ocean is larger than the Caribbean Sea. The Atlantic Ocean is the second largest ocean in the world, covering an area of about 41.1 million square miles, while the Caribbean Sea is a relatively small sea, covering an area of about 1.06 million square miles. The Atlantic Ocean surrounds the Caribbean Sea and is connected to it through the Caribbean islands and the Gulf of Mexico. **

It ultimately depends on personal preference and what one is looking for in a coastal destination. The North Sea is known for its rugged coastline, strong winds, and sandy beaches, making it popular for water sports and outdoor activities. On the other hand, the Baltic Sea offers calmer waters, picturesque fishing villages, and historic towns, making it a more tranquil and relaxing option for those seeking a peaceful seaside retreat. Both seas have their own unique charm and attractions, so the choice between the two would depend on individual preferences. **

The name of the sports boat license for the coastal sea is typically called the "Coastal Skipper" or "Coastal Boating License." This license allows individuals to operate a sports boat in coastal waters, typically up to a certain distance from the shore. It requires knowledge of navigation, safety procedures, and maritime regulations specific to coastal areas. Obtaining this license demonstrates a certain level of competency and understanding of boating in coastal environments. **

No, the Baltic Sea is not a Wadden Sea. The Wadden Sea is a coastal wetland area in the southeastern part of the North Sea, known for its extensive tidal flats and salt marshes. The Baltic Sea, on the other hand, is a brackish sea located in Northern Europe, bordered by several countries including Sweden, Finland, and Germany. While both bodies of water are important coastal ecosystems, they are distinct in their geographical and ecological characteristics. **