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<em>D. deep below ground, after being exposed to extreme heat and pressure</em>
Hello!
The body of a sponge is not very complex, mainly because it has no cells. It has 2 outer layers and supportive needles, but no cells!
Enjoy.
~Isabella
<span>Modern sea star larvae resemble some primitive vertebrate larvae and this similarity suggest that the primitive vertebrates share a common ancestry with sea stars
it means their ancestors shared some common features so that is why it resemble primitive vertebrate larvare
hope it helps</span>
Answer:
The heart muscle would continue to contract but its contraction rate may change. Only the atria would be able to contract. Systolic contraction would still occur, but diastolic relaxation could not occur.