Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms. They require other organisms to host themselves in order to survive and as such, they are regarded as obligate parasites. Learn more about viruses and cell assimilation in this tutorial...
The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas others have many cells that are organized into tissues, organs, and systems. The scientific study of the cell is called cell biology. This field deals with the cell structure and function in detail. It covers..
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pathogens. Read this tutorial to learn the first and second lines of defense that the human body employs. ..
Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stages of cell respiration in this tutorial...
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived. Life continued to diversify resulting in the rise of different organisms competing with one another for survival. Learn more about these single-celled life forms blossoming the primitive Earth...
