Infertility is the inability to conceive a child or carry a child to birth. About 75 percent of causes of infertility can be identified; these include diseases, such as sexually transmitted diseases that can cause scarring of the reproductive tubes …
Covalent network solids include crystals of diamond, silicon, some other nonmetals, and some covalent compounds such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds. The atoms in these solids …
Emf is an extremely important term associated with a cell. When we talk about any circuit, certain components in the circuit insert energy into the circuit while certain components withdraw energy. The device which puts energy into the circuit is …
Biogeography is the study of the geographic distribution of living things and the abiotic factors that affect their distribution. Abiotic factors such as temperature and rainfall vary based mainly on latitude and elevation. As these abiotic factors change, the composition …
The structure of a crystalline solid, whether metal or not, is best described by considering its simplest repeating unit, which refers to its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The …
We know that light doesn’t need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels. Light contrasts with sound, …
Aquatic ecosystems include both saltwater and freshwater biomes. The abiotic factors important for the structuring of aquatic ecosystems can be different than those seen in terrestrial systems. Sunlight is a driving force behind the structure of forests and also is …
The properties of a solution are different from those of either the pure solute(s) or solvent. Many solution properties are dependent upon the chemical identity of the solute. Compared to pure water, a solution of hydrogen chloride is more acidic, …
The Young’s Modulus of a material is a fundamental property of every material that cannot be changed. It is dependent upon temperature and pressure, however. The Young’s Modulus (or Elastic Modulus) is, in essence, the stiffness of a material. In …
Sociobiology is an interdisciplinary science originally popularized by social insect researcher E.O. Wilson in the 1970s. Wilson defined science as “the extension of population biology and evolutionary theory to social organization.” The main thrust of sociobiology is that animal and …