Biology World

The lightest organ in the human body is the lung.  

An ostrich egg is also the largest existing single cell.

When the queen of a clown fish school dies, a male clown fish changes its gender to become female and takes her place.

In seahorses, it's the male who gives birth to the young.

Elephants have been known to remain standing after they die.

House flies have a lifespan of two weeks.

The average person falls asleep in seven minutes.

When you blush, your stomach lining also reddens.

The surface area of a human lung is equal to that of a tennis court.

The human body contains about six-thousand miles of blood vessels.

Every four days the worlds population increases by one million people.

Cell theory

• The cell
  Cell biology
  

  Cell biology is an academic discipline that studies cells – their physiological properties, their structure, the organelles they contain, interactions with their environment, their life cycle, division and death. This is done both on a microscopic and molecular level...
  
   is the fundamental unit of life
  Life
  Life is a characteristic that distinguishes objects that have self-sustaining biological processes from those that do not—either because such functions have ceased , or else because they lack such functions and are classified as "inanimate."In biology, the science of living organisms, "life"...
  
  
• All living things are composed of one or more cells or the secreted
  Secretion
  Secretion is the process of elaborating, releasing, and oozing chemicals from a cell, a secreted chemical substance or amount of substance. In contrast to excretion, the substance may have a certain function, rather than being a waste product....
  
   products of those cells, such as shells
• Cells arise from other cells through cell division
  Cell division
  Cell division is a process by which a cell, called the parent cell, divides into two or more cells, called daughter cells. Cell division is usually a small segment of a larger cell cycle. This type of cell division in eukaryotes is known as mitosis, and leaves the daughter cell capable of dividing...
  
  
• In multicellular organisms, every cell in the organism's body is produced from a single cell in a fertilized egg
  Egg (biology)
  In most birds and reptiles, an egg is the zygote, resulting from fertilization of the ovum. To enable incubation the egg is usually kept within a favourable temperature range as it nourishes and protects the growing embryo. When the embryo is adequately developed it breaks out of the egg in the...
  
  
• The cell is considered to be the basic part of the pathological processes of an organism