Development Of Living Things

(History)

Science seeks to uncover the historical development of living things. From various studies have estimated the first living creature that ever lived was of little creatures types of microorganisms. Small single-celled creatures, such as protozoa, believed to be the beginning of life that exist today. In time millions of years, these tiny creatures evolved into creatures that are more complex. Subsequent developments began to appear other creatures such as insects, reptiles, fish, mammals, and so forth.

 
Accordingly, the development of the earth is also a concern of the experts. The development of the earth has undergone many rounds. The experts divide it into four rounds of development, namely Aziokum age, Paleozoic, Mesozoic, and Neozoikum.

Age Azoikum (Oldest Age)
This era lasted less than 2500 million years. Earth is still a very hot ball of gas that rotates on its axis..

Paleozoic era (Age old life)
This era lasted about 340 million years. The situation is not stable earth, the climate was changing, and rainfall is very large. However, in this era began there were signs of life. Like the single-celled creatures (microorganisms), small animals that invertebrate, fish, and type of algae or grass. The presence of animals and plants on the earth is known from the remains that have helped the so-called fossils. The fossil is commonly found in rocks. Age is also called the primary period (first period).

Mesozoic era (Life Middle Ages)
Mesozoic era occurred around 65 to 200 million years ago. When it began to appear large trees and animals that live on land. This era lasted about 140 million years. Improved climate, rainfall began to decrease. Large rivers and lakes many dry and muddy. The fish can breathe even though there is no water. Fins are very strong, can be used to run. They crawl onto land and began to live on land.

Age Neozoikum
This era lasted about 65 million years ago. Age Neozoikum divided over two days of age Tertiary and Quarternary age.
a. Tertiary Period (Third Age) 
Age is divided into several times, the Paleocene, Eocene, Ologosen, Miocene, and Pliocene. In the Tertiary period lactating animals is growing very rapidly, while the giant reptile species gradually disappeared. Creatures primate (ape-like mammals) began to appear since the Paleocene era.
b. Quarternary Period (Fourth Period)
Quarternary Age began about 600,000 years ago. Age is divided into two epochs, namely Pleistocene (Dilluvium) and when Hollosen (alluvium). 
1. Pleistocene (Dilluvium) 
Pleistocene lasted about 600,000 years ago. Pleistocene become very important because at this time early humans began to emerge. Natural state in this period is still wild and unstable due to the alternation of two ages, namely Glacial and interglacial age.
2. Kala Holocene 
In the early Holocene time, most of the Arctic ice cap is gone, so the sea level rose again. Soils low in the Sunda Shelf and the Sahul Shelf and the sea flooded transgressions. Thus, came the islands of the archipelago. Ancient man disappears, then comes the intelligent human beings (Homo Sapiens) as he has now.