Final answer:
Cells are complex structures with various organelles and specialized functions. Initially simple, cells evolved into more complex forms, with multicellularity allowing for specialized cells and tissues. Plant and animal cells differ, with plant cells having unique structures like cell walls and chloroplasts.
Step-by-step explanation:
Cells are not simple structures; they are highly complex. Every cell, the smallest fundamental unit of structure and function in living organisms, contains various organelles that perform specialized functions, making them quite intricate. For instance, plant cells have unique structures like cell walls and chloroplasts that are not found in animal cells.
The evolution of cells started from primitive forms; the first cells were likely simplistic versions of prokaryotic cells, gradually evolving complex features like DNA and the ability to replicate. Over time, multicellular organisms developed, with specialized cells coming together to form complex organs.
When examining cells under a microscope, the morphology of simple tissues generally consists of less complex structures when compared to the highly organized structure of more complex tissues in multicellular organisms, where cells can be specialized for different functions.