Short answers, pulled from the story.
Robert Hooke discovered the cell in 1665 when he observed a thin slice of cork under a microscope. He coined the term cell from the Latin word cellula, meaning small room, to describe the tiny enclosures he saw.
Prokaryotic cells lack a membrane-bound nucleus and complex organelles, while eukaryotic cells contain a nucleus and specialized organelles like mitochondria and chloroplasts. Prokaryotes include bacteria and archaea, whereas eukaryotes include animals, plants, fungi, and protists.
The largest known bacterium is named Thiomargarita magnifica and can reach lengths of up to 2 centimeters. This size makes it visible to the naked eye, challenging the notion that all bacteria are microscopic.
The human body contains an estimated 30 trillion cells with variations between males and females. There are over 200 distinct cell types, each with specific functions such as muscle cells, nerve cells, and skin cells.
Eukaryotic cells evolved through a process called symbiogenesis where an archaean and a bacterium merged approximately 2.2 billion years ago. This merger introduced mitochondria, and a second event around 1.6 billion years ago added chloroplasts to form green plants.
The ectoderm, mesoderm, and endoderm are the three germ layers from which all animal tissues arise. These layers give rise to structures such as skin, muscles, and internal organs during embryonic development.