… a time, occurring regularly in most mammals, and uncommonly in some of the larger ones, such as cattle, horses, and humans. In humans, the tendency to bear more than one offspring is hereditary (see Heredity), and a mother who gives birth to twins is…

… have the goal and dream to have the perfect body. They believe they will be more popular, or attractive if they achieve the body that they desire. But what lengths will people go to, to get the perfect body? One of the biggest problems in sports…

… in nearly all eukaryotic cells. They are rather large organelles ranging from 0.5µm to 10µm in length and 1µm in diameter. The mitochondria are the energy factories of the cell and are located in the cytoplasm. They are the sites of cellular respiratio…

… sole responsibility is to provide energy for the cell. They do this by synthesizing a molecule known as ATP, which the cell uses as energy. Mitochondria are different from the rest of the cell organelles because they contain their own DNA outside the…

… nucleotides, are largely responsible for intercellular communications within the human organism. These transmissions regulate such functions as hormone secretion, muscle contaction, and even cognition. These transmissions take place because of…

… stage is interphase, next prophase, metaphase, anaphase, and last telephase. Interphase is the longest phase. In this phase, the centrioles begin to replicate, the DNA replicates, and all of the preparations are made to be ready for mitosis to take…

… in which a cell undergoes nuclear division, is one of the four subdivisions of the cell cycle responsible for cell growth and reproduction. The first step in mitosis is prophase. In prophase the chromatin, diffuse in interphase, condenses into chromosome…

… the technology has developed extremely. Computers which took the place of a living-room then, are now being made in creditcard-formats. More and more areas are being taken overby the computer.As computers are capable of handling large amounts of…

… Weed (Asclepias tuberosa) Monarch Butterflies and Butterfly Weed, a type of milkweed, have coevolved as plant and pollinator. This means that they both rely on one another to survive. Milkweed is the primary source of nutrition for monarchs. Monarchs…

… is a infectious disease caused by the Epstien-Barr virus in a estimated 90 percent of cases ( EBV ) a member of the herpes family. The remaining cases are caused by a certain herpes virus, or cytomegalovirus. Mononucleosis is taken from the name…