Let’s start the- DEVELOPMENT OF LIFE IN THE WORLD
INTRODUCTION
ATOM – MOLECULES – CELLS -TISSUE – ORGAN –ORGAN SYSTEM –ORGANISM
It is the lowest level of the organism. It includes all chemicals substances essential for maintaining life. All these chemicals are made up of Atoms, atoms join together to form Molecules.
Cells-cells are the basic structural and functional units of an organism( living thing ) ex-muscle cell, nerve cells. Etc
Tissue-The cells that are similar in structure, origin and function format tissue, there are four types of tissue-
1.epithelial tissue 2.connective tissue 3. muscular tissue 4.nervous tissue
Organ –several types of tissues may join collectively to form an organ that carries out one or more specific functions, ex -kidneys, liver …
Organ system –several organs are interrelated to perform a specific function and thus constitute an organ system ex-
1.Integumentary system
2.Muscular system
3.Skeleton system
4.Circular system
5.Digestive system
6.Respiratory system
7.Excretory system
8.Reproductive system
9.Nervous system
10.Sensory system
11.Endocrine system
Organism –several types of organ systems in the body of an organism show a unique division of labor.
(Run the life of multicellular organism it is called division of labor)
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