characters of echinoderms
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(2 marks) 6. List two characters of echinoderms that they do not share with other animal phyla.
(6 marks) 7. Explain the multiregional hypothesis for the origin of humans, and list two lines of evidence to support it.
(3 marks) 8. What are the differences between the gastrointestinal systems of a flatworm and an earthworm?
(6 marks) 9. Using a Canadian example of an endangered or threatened organism, describe the problem the species faces, discuss whether any conservation efforts were made, and describe how successful they were.
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Biology Revision questions Solution 3
1. List two characters of echinoderms that they do not share with other animal phyla.
1.1. One unique feature is their (usually five-point) radial symmetry comprising several arms (5 or more, mostly grouped 2 left - 1 middle - 2 right), he body actually consists of five equal segments, each containing a duplicate set of various internal organs.
1.2. The other distinct trait amongst most echinoderms is their remarkable powers of regeneration of tissue, organs, limbs, and of asexual reproduction, and in some cases, complete regeneration from a single limb.(Wikipedia 2016)
1.3.
2. Explain the multiregional hypothesis for the origin of humans, and list two lines of evidence to support it.
2.1.1. The multi-regional hypothesis proposes that our early hominid ancestors, including Homo ergaster and Homo heidelbergensis, migrated out of Africa and thus the evolution of modern humans took place ...
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