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the ph, mineral composition and physical structure of rocks and soil limit the distribution of plants and thus of the animals that feed on them.

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Water availability varies in each ecosystem, in aqueous environments water is abundant, however terrestrial organism face a constant challege of desiccation. Water affects oxygen availability, in aquatic environments the slow diffusion of oxygen lowers the rate of cellular respiration in some organisms. To adapt to that, some mangrove trees have roots that extend above the level of the water to obtain oxygen

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sunlight provides energy that drives most ecosystems, too little sunlight can limit the distribution of photosynthetic species. for example shading by leaves makes competition for light. too much light can also limit the survival of organisms, at high elevations the sun's ray are more likely to damage proteins and DNA, prevents tree from surviving above a certain elevation.

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Cells may rupture in low temperatures, and most proteins are also denatured in high temperatures. The optimal temperature of an organism is within a range, some organisms may also expend energy to keep their body temperature within that range.

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Predatory can effect the survival of other species. An inverse relationship effects the predator and the prey, as the predators population grows, the prey's decreases in size.

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the salt concentration of water in the environment affects the water balance of organisms through osmosis most aquatic organisms are restricted to either freshwater or saltwater habitats by their limited ability to osmoregulate. salmon that migrate between freshwater and saltwater use mechanisms to osmoregulate, they balance their salt content bu adjusting the amount of water they drink and by switching their gills from taking up salt in freshwater to excreting salt in the ocean.

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ABIOTIC Factors
Objectives: 
1. Explain how abiotic factors (temperature, water, oxygen, salinity, sunlight and rocks and soil) affect the stability of an ecosystem
2. Provide examples about cell activities that are affected by interactions of biotic and abiotic factors (temperature or water availability)

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ABIOTIC Factors
Objectives: 
1. Explain how abiotic factors (temperature, water, oxygen, salinity, sunlight and rocks and soil) affect the stability of an ecosystem
2. Provide examples about cell activities that are affected by interactions of biotic and abiotic factors (temperature or water availability)

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Describe the biotic components of an ecosystem