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.

Why was the evolution of a coelom a critically important innovation for animals?

The correct answer i option A.

a) The coelom can act as a hydrostatic skeleton

Coelom is a hollow, fluid-filled cavity found in many living organisms. This coelom acts as a protective cushion for their internal organs. This is partially lined with mesoderm.

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.