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Using the figure below, which statement best describes what Urbilateria represents? (type 1, 2 or 3 in the blank) 1. A fictitious bilateral ancestor that represents the common ancestor between protostomes and deuterostomes 2. A factual fossilized bilateral ancestor that represents the common ancestor between protostomes and deuterostomes 3. A fictitious radial ancestor that represents the common ancestor between protostomes and deuterostomes The figure is illustrating the debate as to how protostomes and deuterostomes evolved segmentation. Which statement below best describes why this evolutionary step was thought to be significant for animals? 1. segmentation may have given animals larger brain capacities 2. segmentation may have given animals greater movement capabilities 3. segmentation may have given animals greater digestive capacities Protostome Urbilateria Deuterostome

Which statement below best describes the Cambrian Explosion? (type 1, 2 or 3 in the blank) 1 a mass extinction event caused by a meteorite striking the Earth 540 million years ago 2. the diversification of plant life onto land 3. the diversification of animal life in the Cambrian seas Using the figure below of the species Pikea, which of the following statements best describes its significance in animal evolution? 1. It is the only animal of the time period that could be the ancestor of all chordates 2. It is the only animal of the time period that could swim in a fish-like manner 3. lt is the only animal of the tme period that had a brain

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Answer #1

Urbilateria represent the factual fossilized bilateral ancestor to protostomes and deutrostomes. Hence, option

2 is correct.

Segmentation may have given greater movement capability. Hence, option 2 is correct.

Cambrian explosion lead to the diversification of animal life. Hence, option 3 is correct.

Pikea is the animal that could be the ancestor of chordates. Hence, option a is correct.

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