the cell part that allows substances to go into and out is called semi permeable membrane.
answer: its because of the plants lives or survives in the water just like algaes and so on
also the planktons.planktons is microscopic that fishes eats. planktons have a green pigment even though it is microscopic
Most of the living organisms you see around you are made up of many cells. Some of these cells have similar functions, so they form a group to perform a common function. This group is called a tissue.
Why do cells with similar functions need to form tissues? Remember that a multicellular organism is made up of hundreds to billions of cells, depending on how large an organism is. The list below shows some good reasons why cells need to form tissues.Efficiency - Cells with the same function can share the workload with other cells. This also goes for transport of nutrients. It is easier and more efficient to transport nutrients to a group rather than going to each individual cell, given that these cells have the same needs as well. Specialization - When you have a multicellular organism, not all cells should perform the same functions. This will only lead to chaos within the organism. There should be tissues for immunity, for digesting food, for collecting and releasing of waste, etc. If tissues will not specialize, multicellular organisms would not exist.