Living Organisms are entities that exhibit the characteristics of life. These characteristics include the ability to grow, reproduce, respond to stimuli, maintain homeostasis (internal stability), obtain and use energy, and undergo evolutionary adaptation. Living Organisms are composed of cells, which are the basic structural and functional units of life.

Birth, Life, and Death:

Birth: Birth refers to the beginning of an individual's life. In most organisms, birth occurs when an organism is produced through reproduction, either sexually or asexually. In sexual reproduction, two parents contribute genetic material to produce offspring, while in asexual reproduction, a single parent gives rise to genetically identical offspring.

Life: Life encompasses the entire duration of an organism's existence. During this period, organisms carry out various biological processes necessary for survival, growth, and reproduction. They interact with their environment, obtain nutrients and energy, and engage in activities that ensure their well-being.

Death: Death is the end of an organism's life. It is the irreversible cessation of vital functions, including metabolism and brain activity. Death can occur due to various factors such as disease, injury, or old age. After death, the organism undergoes decomposition and returns to the environment in the form of nutrients for other organisms.

Examples of Living Organisms in Different Environments:

Water: Examples of living organisms in water include fish, whales, dolphins, sharks, jellyfish, and various types of plankton, such as diatoms and zooplankton.

Air: 

In the air, living organisms include birds, insects (such as butterflies and flies), bats, and various types of airborne bacteria and fungi.

Land: 

On land, living organisms are abundant and diverse. Examples include mammals like humans, elephants, dogs, and cats; reptiles like snakes and lizards; birds like eagles and sparrows; insects like ants and beetles; and plants such as trees, flowers, and grasses.

Vacuum: 

In the vacuum of outer space, the conditions for life as we know it are extremely challenging. However, certain microorganisms called extremophiles can survive in extreme environments, including vacuum conditions. Tardigrades (water bears) are one example of a microorganism capable of withstanding the harsh conditions of space.

It's important to note that while we have discovered life in various environments, the existence of life in a true vacuum (devoid of any matter) is currently speculative and has not been observed or confirmed.