b. The placenta passes oxygen, nutrients, and other useful substances from the mother to the fetus.
c. The placenta mixes blood from the mother and fetus together.
d. The placenta protects the mother from being attacked by the fetal immune system.
choanocytes - spelling might be off on that... it means collared cells from Latin roots.
Answer:
Choanocytes
Explanation:
Choanocytes are membranous flagellate cells lining the spongiocelium (central body cavity of Porifera kingdom animals) and other internal vibrating chambers of sponges.
The movement of its flagellacreates the water stream that brings nutrients and gases. The nutrients are filtered by the choanocyte, which is not a solid structure, but rather a set of small erect rods separated by spaces.
Any organic particle or plant microorganism trapped in the choanocyte is routed down toward the cell body and endocyted, with intracellular digestion occurring in digestive vacuoles.
Answer: The correct answer is- This relationship is one of example of mutualism.
Mutualism can be described as a biological interaction between two species that live in close association with each other in a way that both the partners are benefited from each other. It is a type of symbiotic relationship.
Lichen shows mutualistic relationship between algae and fungus, where photosynthetic algae provides food source to the fungi and fungi in return provides protection to algae as well as provides nutrients from the surrounding.
Thus, it is an example of mutualism.