Why was the evolution of a coelom a critically important innovation for animals?
a) the coelom can act as a hydrostatic skeleton.
b)the coelom gives rise to a complex nervous system.
c)the coelom made it possible for animals to colonize land.
d)the coelom separates vertebrates from invertebrates.

Answers to mastering biology drag the labels to their appropriate locations to complete the punnett squares for morgan's reciprocal cross. drag blue labels onto the blue targets to indicate the genotypes of the parents and offspring. drag pink labels onto the pink targets to indicate the genetic makeup of the gametes (sperm and egg). labels can be used once, more than once, or not at all. hints