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Flatworms and Roundworms have bilateral symmetry as a body type.
Prey size and availability.
No, the internet defies size limits.
its exoskeleton
yes
The size to mass ratio
If the cardiac size is within the upper limits of normal, it means that the heart is still a normal size, but is on the larger size of all normal hearts. There is a range for how big the heart is allowed to be.
Binding forces among the nucleons.
Indeterminate growth limits the growth and size of an invertebrate. It is so they can be more efficient and have more room to carry out their activities.
The strength of joints limits the size of red muscle fibers.
Well, you could of searched it up on the net in images but flatworms color is browinsh and roughly 20 cm.
The cell membrane is the answer! Thanks for asking!