Given a scientific question, generate a correct answer to it.
--------
Question: What class of organisms help decompose matter to release nutrients and make nutritious food for other organisms ?

Answer: fungi

Question: On the ventral side of the embryonic disc, opposite the amnion, cells in the lower layer of the embryonic disk (the hypoblast) extend into the blastocyst cavity and form this?

Answer: yolk sac

Question: Which type of tree loses its leaves each fall and remains leafless in the winter?

Answer:
deciduous