Among protostomes, which morphological trait has shown the most diversity?
A) direction of gastrulation protostome vs. deuterostome) B) number of embryonic tissue types diploblasty vs. triploblasty) C) type of body cavity coelom vs. pseudocoelom vs. acoelom) D) type of symmetry bilateral vs. radial vs. none)
In arthropods, the hemocoel performs which of the following functions?
A) acts as a hydrostatic skeleton-for mobility-in larval stages B) provides space for the internal organs to grow and function C) allows for the circulation of bodily fluids D) all of the above