ty: N r studies of animal phyla laoia). How can you explain this in ets) and cho
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ty: N r studies of animal phyla laoia). How can you explain this in ets) and chordeay example, arthropods (Ecdysozoa) chos oladesHow can you explain this in terms of their our s of their evolution ary history? on, the body form of certain present-day on sugh be described as simple, yet these might be described as simple. alized structures, perhaps unique to their particular may have animals this point using examples from some of the simpler 9 anisms you have dissected organ ancestral features (those that arose early in the evolution of animals to more derived traits (those that arose later). However, animals with am- ha e n ?ma ls with derived traits not completely replaced 5. One mig 5 One might conclude that certain trends can be detected,trends from cestral characteristics still successfully exist on Earth today Why isthis b to illustrateExplanation / Answer
Some animals developed some specialized structures unique to phylum
e.g. In phylum Annelida Body of Earthworms and other segmented worms looks simple but when we dissect it we found Worms possess a spacious coelom, a closed circulatory system, an efficient excretory system and a closed circulatory system. They contain a pair of hard bristles on each segment called setae which are used for locomotion. These are unique feature of this phylum Annelida.
e.g. In Phylum Arthropoda, We have dissected Cockroach body which contains the head, thorax and abdomen. There are three pairs of walking legs attached to the thorax, and sometimes one or two pairs of wings. Cockroach also possesses one pair of antennae, and a mandible. They possess a hard external shell called an exoskeleton made up of a stiff material called chitin. Arthropods are characterized by their paired, jointed appendages, which are often specialized to perform a certain function. These are unique feature of this phylum Arthropoda.
e.g. In Phylum Chordata Class Mammalia, A notochord, or a longitudinal, flexible rod between the digestive tube and the nerve cord. In most vertebrates, it is replaced developmentally by the vertebral column. Their skin contain sweat glands, their hearts are made up of four chambers. Female species possess mammary glands.We have dissected rats which shows these unique feature of this phylum Chordata Class Mammalia
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