P1. A few fish species lay very big eggs and have big larvae with functioning gills...

P1.

A few fish species lay very big eggs and have big larvae with functioning gills from early on. However, most fish lay small eggs and the small larvae have no gills until later in life. In 2-3 sentences, explain the difference in the need for gills in small vs. large fish larvae. Use proper terminology

P2.

In 50-70 words, discuss the advantages and drawbacks of being an endothermic homeotherm vs. an ectothermic poikilotherm. Compare a small mammal with a lizard of the same body weight and discuss their scope of activity, metabolic rate and energy use under different environmental conditions .

Expert Solution

Answer-1 The small size larva needs small amoun of gaseous exchange that can be completed without the gills through skin surface exchange. the big fish larva need gills for gaseous exchange but some other functions are also performed by gills in big fish larva. the adaptation makes them to live in this way.

Answer-2 The homotherm maintain constant body temperature but by increasing or decreasing their metabolic rate. the endotherms can not maintain their body temperatre, they totally dependent on external environment. ectotherm can maintain their body temperature constant without depending on external environment. the poikilotherms can not maintain their body temperature.

gladiator answered 3 years ago

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