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In a burning candle, there are both physical and chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.

The first cholera pandemic emerged out of the Ganges Delta with an outbreak in Jessore, India, in 1817, stemming from contaminated rice.
The disease quickly spread throughout most of India, modern-day Myanmar, and modern-day Sri Lanka by traveling along trade routes established by Europeans.

The lanthanide series consists of the 14 elements, with atomic numbers 58 through 71, that follow lanthanum on the periodic table of elements.

The lanthanides include the metals cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).

In 2018, IMO adopted an Action Plan to address marine plastic litter from ships

Secondary pollutants are pollutants which form in the atmosphere.
These pollutants are not emitted directly from a source (like vehicles or power plants).
Secondary pollutants are certain gases that are synthesized by photochemical reactions in the lower atmosphere.
Some important secondary pollutants, most notably ozone, peroxy acetyl nitrate, hydrogen peroxide and aldehydes.
Ozone is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight

A Head mirror is a simple diagnostic device, stereotypically worn by physicians. A head mirror is mostly used for examination of the ear, nose & throat.

Thee concave mirror helps in gathering more light and produces a clear image of a distant object. Medical use: Dentists and ENT specialist doctors use concave mirrors to get a magnified clearer view of the teeth, skin and ear cavities.

Coliforms are bacteria that are always present in the digestive tracts of animals, including humans, and are found in their wastes. They are also found in plant and soil material.
Staphylococcus bacterium is a member of the microbiota of the body, found in the upper respiratory tract and on the skin.
Salmonella lives in the intestinal tracts of animals and birds and is transmitted to humans by contaminated foods of animal origin.
Sulfur bacteria are found in the anoxic layer of their habitat, which promots the growth of many heterotrophic organisms by supplying inorganic nutrients to the above oxic layer.

Halite, commonly known as rock salt, is a type of salt, the mineral form of sodium chloride

Vitamin C and niacin are most concentrated in the peel. Vitamin C is an essential vitamin, meaning your body can’t produce it. Yet, it has many roles and has been linked to impressive health benefits. It’s water-soluble and found in many fruits and vegetables, including oranges, strawberries, kiwi fruit, bell peppers, broccoli, kale, and spinach.

The stopping or controlling of bleeding is called hemostasis and the opposite of hemostasis is called hemorrhage.

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