Question

article on animals for help

Answer 1

The domestic dog (Canis lupus familiariswhen considered a subspecies of the wolf or Canis familiaris when considered a distinct species)[4] is a member of the genus Canis(canines), which forms part of the wolf-like canids,[5] and is the most widely abundant terrestrial carnivore.[6][7][8][9][10] The dog and the extant gray wolf are sister taxa[11][12][13] as modern wolves are not closely related to the wolves that were first domesticated,[12][13]which implies that the direct ancestor of the dog is extinct.[14] The dog was the first species to be domesticated[13][15] and has been selectively bred over millennia for various behaviors, sensory capabilities, and physical attributes.[16]

Domestic dogs

Temporal range: Late Pleistocene – Present (at least 14,700–0 years BP)

Selection of the different breeds of dog

Conservation status

Domesticated

Scientific classificationKingdom:AnimaliaPhylum:ChordataClass:MammaliaOrder:CarnivoraFamily:CanidaeGenus:CanisSpecies:C. lupusSubspecies:C. l. familiaris[1]Trinomial nameCanis lupus familiaris[1]

Linnaeus, 1758

Synonyms

Canis familiaris Linnaeus, 1758[2][3]



Dogs show great morphological variation

Their long association with humans has led dogs to be uniquely attuned to human behavior[17] and they are able to thrive on a starch-rich diet that would be inadequate for other canid species.[18] Dogs vary widely in shape, size and colors.[19] Dogs perform many roles for humans, such as hunting, herding, pulling loads, protection, assisting police and military, companionship and, more recently, aiding handicapped individuals and therapeutic roles. This influence on human society has given them the sobriquet "man'

Answer 2

Answer:

Many chemical reactions can be classified as one of five basic types. Having a thorough understanding of these types of reactions will be useful for predicting the products of an unknown reaction. The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.

Combination Reactions

A combination reaction, also known as a synthesis reaction, is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions .The general form of a combination reaction is:

A+B→AB(5.3.1)

One combination reaction is two elements combining to form a compound. Solid sodium metal reacts with chlorine gas to product solid sodium chloride.

2Na(s)+Cl2(g)→2NaCl(s)(5.3.2)

Notice that in order to write and balance the equation correctly, it is important to remember the seven elements that exist in nature as diatomic molecules ( H2 , N2 , O2 , F2 , Cl2 , Br2 , and I2 ).

One sort of combination reaction that occurs frequently is the reaction of an element with oxygen to form an oxide. Metals and nonmetals both react readily with oxygen under most conditions. Magnesium reacts rapidly and dramatically when ignited, combining with oxygen from the air to produce a fine powder of magnesium oxide.