Protection against heat and cold
(1) By reducing the flow of heat from the surroundings and
(2) by increasing the dissipation of heat from the body.
One way of decreasing the absorption of heat from the surroundings is by having so little body area as possible. A spherical form has the smallest surface area in relationship to volume, the surface area in relation to volume also decreases with increased body size. Another factor is colour. White absorbs less heat compared to a dark surface. Therefore, large, round, white organisms absorb heat slowly. Because sun soaked cliffs and rocks can be very warm, it is important to have so little surface contact against them as posible.
|Cliffs and rocks are fantastic!|
|Zoning and flecked occurrence|
|Animals that are attached|
|Variation and change|
|Variations in water level|
|Both cliffs and rocks|
|Freshwater and saltwater|
|Geography, climate and history|
|Organisms life cycles|
|Organisms effect on each other|
|Energy and the flow of material|