1) Lipids are the waxy, greasy, oily molecules found in the body.
2)They are water-insoluble (hydrophobic), and this property is useful in the organisation of cells and tissues.
3)Lipids can be extracted from cells using non-polar solvents . Example chloroform or benzene.
The answer to number 1 is that not all animals have hair
Answer:
The correct answer is A the excretory system when it sends out liquid waste as urea
Explanation:
The respiratory system play an important role in the the transport of oxygen and carbon dioxide in and out of the body thus maintaining the homeostasis of oxygen carbon dioxide ratio in our body which is very very important in maintaining the normal body physiology.
On the other hand the excretory system maintaintain homeostasis by interaction with respiratory system.Excretory system helps in the removal of waste material such as urea,ammonia and uric acid from our body through urine.The accumulation of waste products can hamper the normal body physiology.Thus excretory system also helps in maintaining the homeostasis of our body.
Organisms are classified and divided in a community based on the modern classification system that was published by Carolous Linnaeus in the 18th century.
This criteria is also known as the Linnean system of classification, where the organisms are classified according to the following: Species, Genus, Family, Order, Class, Phylum and Kingdom.
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receptor
an organ or cell able to respond to light, heat, or other external stimulus and transmit a signal to a sensory nerve.
a region of tissue, or a molecule in a cell membrane, which responds specifically to a particular neurotransmitter, hormone, antigen, or other substance.