Drugs are chemical substances. There are three different types of drugs: stimulants, depressants and hallucinogens.
Stimulants speed up the central nervous system. They increase heart rate, blood pressure and breathing. Examples are caffeine, nicotine, amphetamines, ecstasy and cocaine.
Depressants slow down the central nervous system. They decrease heart and breathing rates. Alcohol, heroin and analgesics are common examples of these types of drugs.
Hallucinogens change mood, thought and senses. LSD is the most well-known example of this type of drug.
A traditional market
A traditional market is the type of market where people can bargain the prices. The items sold in traditional market are basically the same. They are fruits, vegetables, meat and fish, spices, dry good and household items. At the glances, the market may seem to be disorganized mess.
Surrounding the market there are many small scale traders, usually selling fruits. This traders can not afford the cost of renting a stall inside the market.
On the first floor of the market, there are permanent kiosks and stall selling textile, stationery, clothing, electronic goods, household appliances, gold shops, etc.
On the second floor, people can buy meat and fish, fruits, vegetables, and dry goods. The sellers sell fruits and vegetables through the middle area. Meanwhile they sell dry goods in the edge area of the second floor
Birds are interesting flying animals. They are vertebrates and warm blooded animals. They belong to aves class and they can be found all over the world.
Birds breathe with their air pocket. Beside as respiration organ, air pocket also can enlarge or reduce their weight when flying or swimming.
There are many kinds of birds. Earth bird has special characteristic. They have different morphology according to their food and their habitat. Some of them eat seeds, pollen, fish or meat. There are some species that live in land and the others live in water. Land birds live on their nest.
Female birds have specific tasks. They lay eggs and feed their baby, beside that they look for foods for their baby.
Ants are social insects, which means they live in large colonies or groups. Some colonies consist of millions of ants. There are three types of ants in each species, the queen, the sterile female workers, and males. The male ants only serve one purpose, to mate with future queen ants and do not live very long. The queen grows to adulthood, mates, and then spends the rest of her life laying eggs. A colony may have only one queen, or there may be many queens depending on the species. Ants go through four stages of development: egg, larva, pupa, and adult.
Ants have three main parts. The head, the trunk(middle section), and the rear or metasoma. All six legs are attached to the trunk. The head consists of the jaws, eyes, and antennae. The eyes of ants are made up of many lenses enabling them to see movement very well. The antennae are special organs of smell, touch, taste, and hearing. The metasoma contains the stomach and rectum. Many species of ants have poison sacks and/or stingers in the end of the metasoma for defense against their many predators.
Ants do not have lungs. Oxygen enters through tiny holes all over the body and Carbon Dioxide leaves through the same holes. There are no blood vessels. The heart is a long tube that pumps colorless blood from the head back to the rear and then back up to the head again. The blood kind of coats the insides of the ants and is then sucked into the tube and pumped up to the head again. The nervous system of ants consists of a long nerve cord that also runs from head to rear with branches leading to the parts of the body, kind of like a human spinal cord.
If you watch ants for any length of time you will see that they really do communicate with each other and very effectively too. Ants communicate by touching each other with their antennae. Ants also use chemicals called pheromones to leave scent trails for other ants to follow.