Their mass because it can let you know their weight and size
Think about skin cells. Skin cells shed every day, if cell division didn't take place, you would just constantly be losing skin cells.
Answer:
Sponge; Radial Symmetry; Endoskeleton; Absent Appendages; Absent Segmentation
Cnidarians; Radial Symmetry; No Skeleton; Non-Jointed Appendages; Absent Segmentation
Roundworms; Radial Symmetry; No skeleton; Absent Appendages; Absent Segmentation
Annelids; Radial Symmetry; No skeleton; Absent Appendages; Present Segmentation
Mollusks; Bilateral Symmetry; Exoskeleton; Non-Jointed Appendages; Absent Segmentation
Arthropods; Bilateral Symmetry; Exoskeleton; Jointed Appendages; Present Segmentation
Echinoderms; Bilateral Symmetry; Endoskeleton; Non-Jointed Appendages; Absent Segmentation
Vertebrates; Bilateral Symmetry; Endoskeleton; Jointed Appendages; Absent Segmentation
Tertiary consumer because you have no predators trying to eat you. You are at the top of the food web
It is responsible for your body's 'fight or flight' reaction it also looks after the workings of your body during rest and recuperation. It also controls your heart rate and body temperature under normal conditions.
