Biology & Chemistry

The British Shorthair is the pedigreed version of the traditional British domestic cat, with a distinctively stocky body, thick coat, and broad face. The most familiar colour variant is the “British Blue”, with a solid grey-blue coat, pineapple eyes, and a medium-sized tail. The breed has also been developed in a wide range of other colours and patterns, including tabby and colourpoint.

It is one of the most ancient cat breeds known. In modern times, it remains the most popular pedigreed breed in its native country, as registered by the UK’s Governing Council of the Cat Fancy (GCCF). A quarter of all kittens registered with the GCCF each year are British Shorthairs, making the British the most popular pedigree cat in the UK.

The breed’s good-natured appearance and relatively calm temperament make it a frequent media star, notably as the inspiration for John Tenniel’s famous illustration of the Cheshire Cat from Alice in Wonderland. The Cat Fanciers’ Association profile reads: “When gracelessness is observed, the British Shorthair is duly embarrassed, quickly recovering with a ‘Cheshire cat smile’.”

History
Researchers are not sure how cats first reached the British Isles. In many other parts of Europe cats became common at the same time as the spread of the Roman Empire, however it appears that housecats reached the British Isles before the Romans did.

These cats then interbred with the local European wildcat population. Over the centuries, their naturally isolated descendants developed into distinctively large, robust cats with a short but very thick coat, to better withstand conditions on their native islands. Based on artists’ representations, the modern British Shorthair is unchanged from this initial type.

The great white shark (Carcharodon carcharias), also known as the white shark, white pointer, or simply great white, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans. It is the only known surviving species of its genus Carcharodon. The great white shark is notable for its size, with the largest preserved female specimen measuring 5.83 m (19.1 ft) in length and around 2,000 kg (4,410 lb) in weight at maturity.[3] However, most are smaller; males measure 3.4 to 4.0 m (11 to 13 ft), and females measure 4.6 to 4.9 m (15 to 16 ft) on average.[4][5] According to a 2014 study, the lifespan of great white sharks is estimated to be as long as 70 years or more, well above previous estimates,[6] making it one of the longest lived cartilaginous fishes currently known.[7] According to the same study, male great white sharks take 26 years to reach sexual maturity, while the females take 33 years to be ready to produce offspring.[8] Great white sharks can swim at speeds of 25 km/h (16 mph)[9] for short bursts and to depths of 1,200 m (3,900 ft).[10]

The great white shark is arguably the world’s largest-known extant macropredatory fish, and is one of the primary predators of marine mammals, such as pinnipeds and dolphins. The great white shark is also known to prey upon a variety of other animals, including fish, other sharks, and seabirds. It has only one recorded natural predator, the orca.[11]

The species faces numerous ecological challenges which has resulted in international protection. The International Union for Conservation of Nature lists the great white shark as a vulnerable species,[1] and it is included in Appendix II of CITES.[12] It is also protected by several national governments, such as Australia (as of 2018).[13] Due to their need to travel long distances for seasonal migration and extremely demanding diet, it is not logistically feasible to keep great white sharks in captivity; because of this, while attempts have been made to do so in the past, there are no known aquariums in the world believed to house a live specimen.[14]

The great white shark is depicted in popular culture as a ferocious man-eater, largely as a result of the novel Jaws by Peter Benchley and its subsequent film adaptation by Steven Spielberg. Humans are not a preferred prey,[15] but nevertheless it is responsible for the largest number of reported and identified fatal unprovoked shark attacks on humans.[16] However, attacks are rare, typically occurring fewer than 10 times per year globally.[17][18]

The tooth (plural teeth), Latin and technical term Dens (plural Dentes), is a hard structure in the oral cavity of vertebrates. The teeth are used to grasp, crush and grind food. They have developed in vertebrates according to the form-function principle. In humans, other functions include sound production (especially dental sounds) and social functions.

An apple is a round, edible fruit produced by an apple tree (Malus spp., among them the domestic or orchard apple; Malus domestica). Apple trees are cultivated worldwide and are the most widely grown species in the genus Malus. The tree originated in Central Asia, where its wild ancestor, Malus sieversii, is still found. Apples have been grown for thousands of years in Asia and Europe and were introduced to North America by European colonists. Apples have religious and mythological significance in many cultures, including Norse, Greek, and European Christian tradition.

Apples grown from seed tend to be very different from those of their parents, and the resultant fruit frequently lacks desired characteristics. For commercial purposes, including botanical evaluation, apple cultivars are propagated by clonal grafting onto rootstocks. Apple trees grown without rootstocks tend to be larger and much slower to fruit after planting. Rootstocks are used to control the speed of growth and the size of the resulting tree, allowing for easier harvesting.

There are more than 7,500 cultivars of apples.[3] Different cultivars are bred for various tastes and uses, including cooking, eating raw, and cider or apple juice production. Trees and fruit are prone to fungal, bacterial, and pest problems, which can be controlled by a number of organic and non-organic means. In 2010, the fruit’s genome was sequenced as part of research on disease control and selective breeding in apple production.

Worldwide production of apples in 2021 was 93 million tonnes, with China accounting for nearly half of the total.[4]