Sponges have a Contractile vacuole that squeezes out waste
it's a type of membrane that regulate/control the osmotic pressure of the sponge, which will also periodically throw out it's waste
hope this helps
Answer:
A.
Explanation:
stem cells are body cells that haven't been given a purpose yet. so they can fill in where they are needed most. but they cannot form back into stem cells.
it's not easy to eat healthy especially with all the fast-food chains situated around urban areas. but there should still be affordable, healthy food in supermarkets in stuff like that in urban/rural areas. fast-food should not be the only avaliable food around, but since it tastes good and is sold cheaply its eaten a lot, which negatively affects the health of people living in those areas
