(a) identify specimens A and B (b) (i) Name the group or class of animals to which each specimen belongs (ii) State the location of specimen B in the organism (c) State two characteristic features common to specimens A and Band which adapt them to their functions (d) What is the function of specimen A in the organism? (e) Suggest the habitats of the animals to which each of the specimens belongs (f) Make a labelled drawing 6 to 7cm long of specimen B to illustrate its essential features.
(a) Specimen A is a piece of mammalian lung. Specimen B is the gill of a fish (b) (i) The class of specimen A is mammal. The class of specimen B is fishes or pisces (ii) Specimen B is found below the operculum (c) Characteristic features of specimens A and B which adapt them to their functions are: (i) They are highly vascularized or have a lot of blood vessels (ii) They have thin surfaces (ii) They are soft and moist (iv) They have irregular surfaces to create large surface area (d) The function of specimen A in the organisms is for gaseous exchange (e) The habitats of the animals to which each of the specimens belongs are specimen A terrestrial habitat; specimen B aquatic habitat
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