Human Cells ,Biomas and specie evolution

 A human cell is a basic unit of life that is responsible for carrying out various functions in an organism. A human cell has a membrane that separates it from its environment and regulates the movement of substances in and out of the cell. A human cell also has a nucleus that contains genetic material and controls gene expression. A human cell has various organelles that perform specific tasks, such as mitochondria for energy production, ribosomes for protein synthesis, and lysosomes for waste disposal. A human cell can communicate with other cells through chemical signals or physical contact. A human cell can divide and reproduce through mitosis or meiosis. A human cell can differentiate into different types of cells, such as nerve cells, muscle cells, or blood cells. A human cell can also die in a controlled manner through apoptosis.

Human cell Biomass

The distribution of cell biomass in the human body is dominated by muscle and fat cells, while red blood cells, platelets, and white blood cells largely influence cell counts. Each cell type typically maintains a characteristic size range, which is uniform throughout an individual’s development, and the same holds across mammalian species . The number of cells in the human body varies depending on age, sex, and other factors. According to a recent study, an adult male is made up of around 36 trillion cells on average, while a female is composed of 28 trillion cells, and a 10-year-old child has 17 trillion cells.

Human Specie timeline 

The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period .

 The timeline reflects the mainstream views in modern taxonomy, based on the principle of phylogenetic nomenclature.