Biolgyu — 6-topic bundle

Living organisms are incredibly diverse, from microscopic bacteria to giant whales, but they all share common characteristics. These traits are essential for life and distinguish living things from non-living matter.

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Prokaryotic Cells are simpler and typically smaller. They don't have a nucleus or other membrane-bound organelles. Their genetic material (DNA) floats freely in the cytoplasm. Bacteria and Archaea are examples of prokaryotes.

Eukaryotic Cells are more complex and generally larger. They have a true nucleus that houses their DNA, and many specialized, membrane-bound organelles. Animals, plants, fungi, and protists are all made of eukaryotic cells.

There are four primary types of tissues in your body:

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You know that cells are the basic units of life, and similar cells often group to form tissues (like muscle tissue or nervous tissue). When different types of tissues come together to perform a specific, larger job, they form an organ.

For an organ to function, these different tissues don't just sit next to each other; they actively coordinate their activities. This coordination happens through several mechanisms: