Because some tissues are duplicated.
It means nothing - there is no such word. Perhaps you mean vital = having life, being essential eg Food and water are vital; without them you die eg The brain, heart, liver, kidneys and so on are your vital organs which keep you alive.
Internal organs eg. heart , lungs
Renal Kidneys are part of the excretory system. Which also includes the bladder, ureter, urethra. The skin and lungs are also considered excretory organs.
A urinalysis lab test can show various things about a person's health, such as the presence of blood, protein, sugar, bacteria, and other substances in the urine. It can also indicate problems with the kidneys, urinary tract, or other organs. Additionally, it can help diagnose conditions like urinary tract infections, kidney disease, and diabetes.
An organ is a part of the body that has its own unique anatomy and which performs a specific function. Eg. Heart : Pumps blood Lungs : Mixes blood with atmospheric oxygen Kidneys : purifies blood Stomach : Digestion etc.
Some are mineral based (eg Arsenic) Some are gaseous (eg Carbon Monoxide) Some are plant based (eg Ricin) Some are animal based (eg poison arrow frog)
Protects some major organs from injury eg. Heart.Provides a framework that supports the body.Provides and Protects red bone marrow.Provides a storage site for excess Calcium.
Frogs have kidneys, an ureter and an urinary bladder, just like mammals, but also exchange substances through their skin eg: water.
the kidney regulates the amount of fluid in the body. Itbasically acts like a filter to ure unwanted waste products ..... eg urea in urine
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depens where it is. some places are high eg South Africa and some are low eg Switzerland
Effectively, all of them. You do need your brain, at least one lung, one kidney, and all of your other organs because many of them are needed for things like metabolism and waste disposal (eg stomach, bladder, thyroid). The Pancreas is one organ you can live without, though.