(x-3)² = (x-3)(x-3)
= x² - 3x - 3x + 9
= x² - 6x + 9
<span>Prokaryotes are divided into 2 domains: bacteria and the archaea (or Archaebacteria).</span>
Answer:
The statements in options A,B,C,D and E are correct:
A. Deuterstomia, Protostomia and Ecdysozoa are clades of bilaterians.
B. Invertebrates do not posses a back bone.
C. Lophotrochozoans posses a flexible exoskeleton for protection from harmful environments.
D. Studies show that sponges do not consist in a group with a common ancestry hence all animals except sponges share a common ancestor.
E. Lophotrochozoans posses three germ layer: the endoderm mesoderm and ectoderm, are bilaterally symmetrical and are invertebrates.
