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There are many levels of organization of life divided into two sections, one is microscopic, and the other is global.At the microscopic level of the organization, first of all, molecules combined to make cell organelles; these organelles combine to create a cell.

A single cell can not do various functions, combining with other cells to make tissues. The tissues combine to make an organ and, further, the organ system. Hence, a complete organism is organized.

At the macro level, many organisms from a species make a population. Again, a community comprises a population of different species鈥攁n ecosystem forms when these communities interact with abiotic factors. Consequently, various ecosystems combine to create a biosphere.

Biology is studied by dividing it into many diversified themes due to its enormous scope and a broad range of areas. Five specific themes are discussed: organization, information, energy and matter, interactions, and evolution. Different examples explain these themes in the section.

Every level of biological organization emerges with new characteristics that are not present in the previous level. For example, a single cell cannot do various functions that can be accomplished by the tissue's coordinated activity.

In neural tissue, many types of cells like glial cells and neurons coordinate to transmit a message throughout the body.

The function of an organism or its parts is mainly related to the structure it assumes. For example, monkeys have long tails that help them to swing between trees in a forest.

When the genes from two individuals (one male andanother female) mix during fertilization, a new organism is developed that has genes from both parents.

The blood type of the organism depends on the blood type of its parents. It is decided by three genes that are IA, IB, IO. The combination of these genes makes the blood type of the organism.

Energy is transferred from one organism to another organism or matter. The ultimate source of energy is the sun, and this energy is captured by plants. Other organisms consume these plants or their products.

For example, rabbits eat carrots and get energy for hopping and reproduction by breaking carbohydrates present in the carrot.

Many interactions at the molecular level are found in an organism. For example, in human beings, the urinary bladder gets the signals from the brain, then opens to empty itself. The process is called micturition that comes under a positive feedback loop.

In an ecosystem, different organisms interact with each other in different manners. For example, in the intestinal tract of humans, many bacteria make the flora that is essential for proper digestion and absorption of the food. It also enhances immunity and vitamin production.