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Crustaceans form a large, diverse arthropod taxon which includes such familiar animals as crabs, lobsters, crayfish, shrimps, prawns, krill, woodlice, and barnacles.

Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object’s speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them.

Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements. He used the Periodic Law not only to correct the hypothesized properties[clarification needed] of some of the already discovered elements but also to predict the properties of eight elements that were yet to be discovered.

Thiamine deficiency is a medical condition of low levels of thiamine (vitamin B1). A severe and chronic form is known as beriberi. There are two main types in adults: wet beriberi, and dry beriberi. Wet beriberi affects the cardiovascular system resulting in a fast heart rate, shortness of breath, and leg swelling. Dry beriberi affects the nervous system resulting in numbness of the hands and feet, confusion, trouble moving the legs, and pain. A form with loss of appetite and constipation may also occur. Another type, acute beriberi, is found mostly in babies and presents with loss of appetite, vomiting, lactic acidosis, changes in heart rate, and enlargement of the heart.

Pumice stone floats in water because it has numerous pores that is filled with gas that makes its average density lower than water.

As a metaphor, a touchstone refers to any physical or intellectual measure by which the validity or merit of a concept can be tested.

Brimstone is chemically Sulphur.

The largest flying bird: Albatross

The largest bird: Ostrich

The second largest bird in the world: Emu

Liquid that keep ice from melting is liquid ammonia.

When liquid ammonia vapourizes it absorbs large quantities of heat without changing its temperature for this reason ammonia is mainly used as refrigerant.

The llama is a domesticated South American camelid, widely used as a meat and pack animal by Andean cultures since the Pre-Columbian era.

An animal that is viviparous gives birth to developed live young. The embryos are raised with special organs in the parents as they develop, that supply nutrients to the growing embryos. This condition is known as matrotrophy, when the embryo receives nutrients directly from the mother and not from the yolk. The difference between ovoviviparity and viviparity is that viviparous animals feed their embryos with nutrients from the mother. Without a large egg, there is no large yolk sac for the embryo to survive on.

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