Project:VisualEditor testing/Test

= Enduring understanding 2.D: Growth and dynamic homeostasis of a biological system are influenced by changes in the system’s environment. =

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= All biological systems from cells and organisms to populations, communities and ecosystems are affected by complex biotic and abiotic interactions involving exchange of matter and free energy =

Cell activities are affected by interactions with biotic and abiotic factors.
Factors that affect cell activities include: Cell density, biofilms, temperature, water availability, and sunlight. Cell density can affect how buoyant the cell is and whether it will float or sink. Biofilms are when bacteria forms in aqueous solutions to create a kind of muck and slime which could be benificial in that it provides nutrients for animals, or could be harmful for other animals if they eat it. Temperature affects the cells metabolic processes and if its too hot the cell will fry and if it is too cold then the cell's metabolism would be too slow and the cell would die. Depending on the water potential of the cell it could be a positive change or negative change. The sun will help out photorespiration in plant cells. So the more sunlight, the more nutrients being produced.

Other factors that influence cell activities are symbiosis, predator-prey relationships, and water and nutrient availability. Symbiosis comes in 3 different types: -Mutualism: Both organisms will benefit (+/+)

-Commensalism: One organism will benefit while the other will remain unchanged (+/0)

-Parasitism: One organism will benefit while another will suffer (+/-)

Predator-prey relationships keep the ecosystem intact. The predators will make sure that the populations of prey do not rise greatly and take over a certain ecosystem.

The more nutrients and water will make the cell more efficient because it can use some of the surrounding materials instead of making their own.

= Homeostatic mechanisms reflect both common ancestry and divergence due to adaptation in different environments. =

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