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The life sciences comprise the fields of science that involv

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landri stoker

on 24 February 2016

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Transcript of The life sciences comprise the fields of science that involv

The Definition
The life sciences comprise the fields of science that involve the scientific study of living organisms – such as microorganisms, plants, animals, and human beings – as well as related considerations like bioethics.
Birds are a group of endothermic vertebrates, characterized by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton.
Birds
Birds eggs
Eggs vary in size and color depending on the spices. Although there is a wide of egg colors, only two pigments contribute to the color of the shell. The first pigment is derived from hemoglobin and the second from bile. Most species lay their eggs in a nest. Nests may vary in size, shape, and construction material, but the most common nest shape is cup-shaped.
Instead they have bills that are made of the protein keratin. Bird bills come in a variety of shapes and sizes and are adapted to the particular diet of each species. Herons, for example, have a sharp, pointed bill that enable them to capture fish. Finches on the other hand have a short, conical bill that is well-suited for cracking open seeds.
Bills of birds
Many species of birds migrate to high latitudes to breed during the spring and summer. Then during the fall and winter months they migrate to regions of lower latitude. Many species follow similar routes each year when migrating. These routes are referred to as migratory flyways.
Why birds migrate
Feathers
The bodies of birds are covered with specialized structures known as feathers that grow out of the skin. No other animal has these. Feathers act as a barrier against water and heat loss.
Flightless birds
flightless birds lack keel on the breastbone to which the flight muscles of flying birds are attached. Instead, the breastbone is shaped like a turtle's shell. It has also been described as a raft, giving this group of birds its name, Ratitae.
modern characteristics
The modified forelimbs, or wings, of birds are used for flying or gliding. The hind limbs are used for walking, perching, or swimming. Swimming birds typically have webbed feet that aid them in moving through water. The hind limbs are used for walking, perching, or swimming. Swimming birds typically have webbed feet that aid them in moving through water. The wing bones are connected by strong muscles to the keeled, or ridged, breastbone, and the pelvic bones are fused so that they are rigid in flight.
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