2. Cell (Plasma) membrane 4. A cell membrane is made of phospholipids, is flexible, and is found in animal cells. A cell wall is made of cellulose, is rigid, and is found in plant cells.
A Sustainable society can be defined as the one which utilizes the various available resources in a judicious and economical manner such that the resources can be retained for a longer period of time to be utilized by the future generations. Two traits of such a society are:
Follows the principle of 3Rs, that is Reduce, Reuse and Recycle. This means the society supports the reduction in overuse of resources, promotes the reuse of resources wherever possible and also supports the idea of recycling several resources to sustain the availability of fresh resources.
Tries to harness and make the best possible use of the available renewable resources. The society tries to maximally utilize the renewable resources to fulfill their needs.
A Non-sustainable society can be defined as the one which uses all the available resources extravagantly and profusely without showing any concern over the amount of the resources available for the future. Two traits of such a society are:
They tend to use the more readily available resources uncontrollably without any restriction and often not considering whether the resources are required immediately and essentially or not .
They tend to waste a lot of resources as often harnessing resources to an extent which is more than the requirement of the resources causes the wastage of the excess resource.
