A famous answer would be from a cybernetic view:
An organism as a living system can reproduce itself and it creates a difference between itself and the environment (and thus creating bidirectional communication). In order to do that, it needs to be able to control and regulate itself. Only then it can be called an organism.
This is a functional approach, meaning that "non-organic" beings may be viewed as organisms aswell (such as machines or robots, but only when both requirements are fulfilled).
There are many examples of multicellular organisms. Us humans are multicellular, animals are multicellular. Smaller organisms are unicells.
All animals are heterotrophs, getting their organic molecules (food, growth) from another organism. Those that consume other organisms are predators. The larger predatory animals that consume smaller animals are carnivores (meat eaters).
animals and humans
In humans and other animals, the organisms produce thick-walled, dormant structures called cysts in the muscle and other tissues of the body.
lower animals are primitive organisms and aren't as smart as humans, mammals etc.
Humans share DNA with other living organisms, such as animals, plants, and bacteria.
The pathogenic organisms are not considered animals at all. The three pathogenic organisms are virus, bacterium, and fungus. All of these can potentially cause illness in animals and humans.
Humans use selective breeding to pass desired traits to the next generation of plants or animals.
The study of humans, plants, and animals is known as anthropology. It seeks to understand the biological and cultural aspects of these organisms, as well as their interactions and relationships with each other and the environment.
No, humans are not prokaryotic. Humans are eukaryotic organisms, which means their cells have a nucleus and other membrane-bound organelles. Prokaryotic organisms, such as bacteria, lack a nucleus and other membrane-bound organelles.
Animals which eat both plants and animals are called omnivores. Humans are an obvious example. 'Omni' derives from a Latin word meaning 'everything' and 'vore' from one meaning 'eating'.
Living organisms that create their own food through photosynthesis, like plants and alge, are known as autotrophs. Organisms that depend on other organisms for energy, like Humans and other animals, are known as heterotrophs