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nadya68 [22]
3 years ago
9

what characteristics of sponges led scientists to conclude that sponges probably evolved separately from other animals?

Biology
1 answer:
sveticcg [70]3 years ago
3 0
They lack true tissues and organs and have no body symmetry. hope it helps
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1. Head, neck, upper limb, thorax - super vena cava - top of the right atrium.

2. Lower limb - inferior vena cava - bottom of the right atrium.

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