The lowest level of environmental complexity that includes living and nonliving factors is the
C: Ecosystem
The third one.……...................
The answer is:
Echinodermata
The word echinodermata is Greek which literally means "Spiny Skin". Echinodermata is a phylum under kingdom animalia. Not all of them have spiny skins, but most of them do. Other characteristics would be their radially symmetric body. They have appendages that grow outward from the center. Examples of echinoderms would be sea stars and sea urchins.
The tissues found within the vein if I must say are xylem and phloem. Glad I can help.
