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Biologists have debated whether viruses are organisms.  They are not.

They can’t reproduce without a host

They can’t get and use energy without a host

They can’t grow and develop

They can’t maintain homeostasis

They can’t respond to stimuli

They aren’t made of cells

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Producers - make their own energy
Consumers - eat other organisms for energy
Decomposers - digest dead organisms for energy

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Uni-cellular:  made up of only one cell.
Multi-cellular:  made up of many cells

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There are two main groups of cells:  Prokaryotes & Eukaryotes
Prokaryotes - always single-celled organism.  Have no nucleus or membrane-bound
organelles.  Very small.  Bacteria are an example of a prokaryote.
Eukaryotes - some are single-celled, some are multi-celled.  All have a nucleus and
membrane-bound organelles.  The smallest ones are still bigger than the
biggest prokaryotes.  Plants, animals, fungi, and protists are all
eukaryotes.

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What's the difference between prokaryotic cells and eukaryotic cells?  Watch this video

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What's the difference between prokaryotic cells and eukaryotic cells?  Watch this video

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Cats reproduce sexually and make kittens
Cats respond to their environment by coming when they hear
a can of cat food being opened
Cats are organized because they are made of cells that form
tissue, organs, and organ systems
Cats use energy by eating and using the energy to move around
Cats grow and develop, growing from kittens to adult cats
Cats maintain homeostasis by drinking water when they are
thirsty

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1)  air
2) water
3) food
4) a place to live

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Living things are RROUGH
Reproduce - living things must be able to reproduce asexually or sexually
Respond -  living things must be able to respond to stimuli
Organized - all living things are made of one or more cells (unicellular or multicellular
Use Energy - all living things must be able to get energy and use that energy for cell processes
Grow and Develop - all living things grow and develop
Homeostasis - all living things must be able to maintain a stable internal environment