| (i) Thermoregulation energetically least expensive process for many organisms like shrews and humming birds. |
| (ii) 99% animals and nearly all plants cannot maintain their constant internal environment. |
| (iii) During the course of evolution, the costs and heights of maintaining a constant internal environment are discarded. |
| (iv) In aquatic animals, the osmotic concentration of the body fluids change with that of the ambient water osmotic concentration. |
A) (i) and (ii)
B) (iii) and (iv)
C) (i) and (iii)
D) (ii) and (iii)
Correct Answer: C
Solution :
[c] Thermoregulation is energetically expensive for many organisms particularly true for small animals like shrews and humming birds. During the course of evolution, the costs benefits of maintaining a constant internal environment are taken into consideration.
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