Sea Cucumbers live in the deep ocean, so they live in salt water.
tentacles that capures small plants called plankton oragan matter
well it depends on what type of sea sponge your talking about there are many different kinda an they all have different sizes
No; sea cucumbers are animals and transparent sea cucumbers are plants.
sea cucumbers are normally 10 to 12 inches (25 to 30 cm) long, 1.5 to 2.0 inches (3.8 to 5.1 cm) in diameter and are often curled up, partially covered with sand from the sea floor.
The tentacles surround the mouth of the sea cucumber, and are covered with a thin film of mucus. Small particls in the water stick toa the coating and covers the tentacles. When a tentcle becomes saturated, the cucumber puts it in its mouth and literally sucks off the food particles. Summary of that little paragraph: Tentacles are the first stage of the Digestive System. They grab food and put it in the mouth.
It is dependent on the environmental water temperature.