Answer:
because the plants are more thanare autotrophs, or organisms that produce their own food. ... They are at the bottom of the food chain because they are eaten by other organisms, and they don't need to eat for energy. Producers make their own food through the process of photosynthesis instead of eating organic matte
The one that is radially symmetrical deuterostome invertebrate that most closely related to chordates is : B. echinoderm
This organisms doesn't have a backbone and known for being radially symmetrical. An example of a echinoderm is a Starfish
hope this helps