The answer is (1) !!
it is one direction, from sun to produces to consumer !!
Most of the marine animals have a stream lined body, which means, they have a sharp and pointed at the front. The pointed front of the organism allow to cut the resistance of the water. In case, the body is not pointed at the front and it is blunt, the water current and flow would resist the movement of the organism further. So, for the locomotion purpose, it is important to have a streamlined body. Further smooth and hair less body also decrease the resistance during the movement in the water.
The process you asked about in your question is called Cell Division
Solid. it's all stuck and linked together, while liquids are flowing along and gases fly around wherever they please. Hope this helps