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the front limbs of whales bats and cats

Bats use their front limbs to fly, whales use them to swim, and cats use them to run and climb. Radius is thin and long and ulna is reduced to vestiges. Toes – Cats have five toes (phalanges) on the front (foreleg), one of these toes is the dewclaw which sits higher up on the foot and does not come into contact with the ground. If you were to look at an x-ray or skeleton-only of the three, you would see very similar structures on each forelimb. The ancestor of tetrapods evolved four limbs, and its descendents have inherited that feature — so the presence of four limbs is a homology. Sharks and bony fish do not. Biogeography, the study of living things around the globe, helps solidify Darwin’s theory of biological evolution. Birds, bats, mice, and crocodiles all have four limbs. For example, all mammals have front limbs that look quite different and are used for different purposes. The hips and legs are slender, as they do not usually support any body weight. Wing shape, governed by the relative lengths of the forearm and the fingers, varies greatly, in adaptation to flight characteristics. Color code each of the bones according to this key: For each animal, indicate what type of movement each limb is responsible for. Each front foot has five metacarpal bones, and each hind foot has four metatarsal bones. In bats four of the digits are thin and exceedingly long to support the modified skin called patagium, while the first digit bears a large curved claw for clinging on to the branches. The skeleton of a generalised bat is shown below. Comparative Anatomy Shown below are images of the skeletal structure of the front limbs of 6 animals: human, crocodile, whale, cat, bird, and bat. Bat - Bat - Form and function: Bats are mammals with front limbs modified for flight. Color code each of the bones according to this key: Humerus [] Carpals [] Ulna [] Metacarpals [] Radius [] Phalanges [] The animals manipulate these limbs in much the same way the cat does, able to flex and bend to suit its needs. The chest and shoulders are large and well-muscled to provide power to the wings. Each animal has a similar set of bones. Over millions of years, changes occurred in the limb bones. Each animal has a similar set of bones. AQUATIC ADAPTATION In aquatic animals such as dolphins and whales, limb is shortened to form a flipper. However, the front limbs of all three animals—as well as humans—have the same basic underlying bone structure. Comparative anatomy of the bones in the front limbs of humans, cats, whales, and bats. For example, birds and bats both have wings, while mice and crocodiles do not. Bats, whales, and many other animals have very similar homologous structures, demonstrating that these creatures all had a common ancestor. The tailbone in human beings is so-named because it is a homologous structure to the beginning of many animals' tails, such as monkeys. Looking a little closer, we will find that some bats have developed an extra bone on the hind limbs near the ankle. The bat and whale have "fingers" that have extended into a wing and fin, respectively. Eventually, the bones performed different functions in each type of animal. Shown below are images of the skeletal structure of the front limbs of 6 animals: human, crocodile, whale, cat, bird, and bat. Not all characters are homologies. Cat limbs help them move from place to place. Feet (excluding toes) – Cats have metacarpals in their front legs and metatarsals in their hind legs. The most obvious changes are of course in the greatly elongated bones of the fore limbs, particualrly the metacarpals and phalanges. A common example of morphological homology is evident in the skeletal structure of the front limbs of vertebrates like humans, cats, whales, bats, porpoises, horses, frogs, etc. Cats are limber and gymnasts they can hope, jump, and stretch to get about anywhere. These similarities suggest that cats, dolphins, bats, and humans had a common ancestor. The structure and order of bones of a human arm are similar to those of the front limbs of a cat, a dolphin, and a bat. Limbs of humans, cats, dolphins, bats, mice, and bats of evolution. Manipulate these limbs in much the same basic underlying bone structure of years, changes occurred the! Both have wings, while mice and crocodiles do not usually support body... Limb bones in aquatic animals such as dolphins and whales, and humans had a common ancestor the same underlying... Of a generalised bat is shown below ’ s theory of biological.! Animals—As well as humans—have the same way the cat does, able flex... 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