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Lizards are a large group of reptiles with more than 5,600 species that can be found throughout most of the world (apart from the oceans, some small islands, the Arctic and Antarctic). The typical appearance of a lizard is generally considered to be a long body and tail, four legs and skin that it usually rough and/or scaly. However, lizards come in many shapes, colors and sizes, although the average size of these animals is about 15-30 cm (6-12 in). Let’s find out which species of lizards is the largest in the world.
Frogs are amphibians that are found throughout most of the world. They begin life as an egg, which hatch into larvae (tadpoles) with tails and gills. They turn into adults at a later stage when they develop legs and lose their tail. There are about 5000 different species of frogs that have been identified. The average size of a frog is about 8 cm (3.1 in) long, but some species are much smaller or larger than this. Let’s find out which of the 5000 species of frogs is the largest in the world.
Scabies is a contagious skin disease caused by the mite known as Sarcoptes scabiei. This mite is very small and is usually only visible with a microscope. It is a human parasite (and also infects some other animals) and buries under the skin where it causes an allergic response. The most common symptoms are an intense itching and rash caused by the burrowing mite. In rare cases, such as in those with a compromised immune system, the mite is able to breed rapidly and this causes a scaly rash with thick crusts of skin. The disease is usually transmitted to others via skin-to-skin contact and symptoms do not usually occur until four to six weeks. There are about 300 million cases of scabies in the world each year. Let’s find out how this disease is treated.
Snakes are long, thin, carnivorous reptiles that are best known for being legless animals. They are often considered to be dangerous to humans as some species are capable of injecting venom that can kill a full grown adult in minutes. However, many species of snakes are nonvenomous and are completely harmless to humans. Snakes are found throughout most of the world, although they are not found in Antarctica and on some small land masses. They can live in a variety of habitats and are also found in the ocean. Most snakes are usually about 1 m (3 ft) in length, although some are much larger and smaller than this. Let’s find out which species of snake is the smallest in the world.
The SAT, once called the Scholastic Aptitude/Assessment Test, is a standardized test for college admissions used in the United States. The test is owned and developed by the College Board and is administered by the Educational Testing Service. The SAT is designed to assess the college readiness of individual students and it is required for entry to many colleges in the United States. It was first introduced in 1926 and since this time it has undergone many changes including several scoring changes. Today, the test is made up of three sections (Math, Writing and Critical Reading) and each of these sections is worth the same amount of points. The average score for each of these sections has historically been around the 500 mark (this means that an average total score is about 1,500). The test usually takes about 4 and a half hours to complete when breaks are included. Let’s find out the maximum possible SAT score that can be achieved.
Viruses are tiny infectious agents that live inside living cells, which is the only place they can replicate. Viruses can infect any organism, from humans through to single cell bacteria. They are best known as the cause of many human diseases, such as the common cold and influenza. Viruses are usually considered to be a form of life because they carry genetic information, reproduce and evolve. They are made up of genetic material (RNA or DNA) and molecules that carry this material, along with a protein coat to protect the genetic information. Viruses can be many shapes, including complex forms. Viruses are very small, about one hundredth the size of a bacteria, and most are too small to be seen with a common microscope. Let’s find out which virus is the largest ever to be discovered.
Bacteria are single celled organisms that have a cell wall, but lack many of the organelles found in more complex cells. They are found virtually everywhere on Earth and it is estimated that could be as many as a billion different species of bacteria. The best known bacteria are those that cause infections in humans, but most are harmless and some are actually helpful for human health. Bacteria are also well known for their small size, which allows them to take in the required nutrients and expel waste products. The average size of a bacteria is 2 micrometers in length with a diameter of just 0.5 micrometers. Almost all species of bacteria are invisible to the naked eye and a microscope is required to view them. However, at least one species of bacteria is large enough to see with human eyes.
Africa is the second largest continent in terms of both area and population. It is located to the south of Europe and the southwest of Asia. Africa is home to the Nile River, which is the longest on the planet, and this river is fed by large lakes and streams on the east of the continent. The series of lakes in this region in known as the African Great Lakes and it is here that the largest lake on the continent is found. Let’s find out which lake is the largest in Africa.
South America is a continent located in the Western Hemisphere and, as the name suggests, is found mostly in the Southern Hemisphere (below the equator). It is the fourth largest continent in terms of area and the fifth largest in terms of population. It is home to 12 countries and 3 dependencies. South America is best known as the home of the Amazon River and the Andes Mountain Range, which is the longest mountain range in the world. These mountains are the starting point for many rivers, including the Amazon, and they also feed many large freshwater lakes. Let’s find out which lake is the largest in South America.
In the universe there are literally billions of stars. These stars range in size, shape and color, but they are all composed of the same materials. Stars are made of 73% hydrogen, 25% helium, 2% of other elements found in space. The size of a star is measured by the radius. The radius is the length from the middle of the star to the outside edge. The unit of measurement used for comparison is the radius of our sun which is 695,500 km or (432,450 miles).