Okay so, the mitochondria are shaped perfectly to maximize their productivity. They are made of two membranes. The outer membrane covers the organelle and contains it like a skin. The inner membrane folds over many times and creates layered structures called cristae. The fluid contained in the mitochondria is called the matrix. The folding of the inner membrane increases the surface area inside the organelle. Since many of the chemical reactions happen on the inner membrane, the increased surface area creates more space for reactions to occur.
Hope that helps (:
C. Cnidarians and echinoderms is the answer.
There are 3 phyla that sorts worms platyhelminthes (flatworms), nematodes (round worms) and annelids (segmented worms). The closest one is C.
hope I Helped!
I believe its metabolic pathways
