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The description of an arthropod with five leg pairs, two pairs of antennae and two main body parts actually describes quite a few arthropods. The crustacean decapods (Decapoda, meaning ten-footed) under order Malacostraca include familiar organisms such as shrimp, krill, prawns and lobsters will have two pairs of antennae located on the first two segments (with the smaller antenna pair known as antennules). The two main body parts would be the fused cephalothorax (loosely, a combination of head and body) and the abdomen (which we might refer to as the 'tail').
Arachnids are arthropods with two main body sections (tagmata), the cephalothorax and the abdomen (prosoma and opisthosoma).
The arthropod with two body sections and four pairs of legs describes well the Arachnids.
This is a chemical element. You can find the how many electron in a single atom by using a periodic table.
The right and left pairs of pulmonary veins.
The descending aorta is divided into two portions, the thoracic and abdominal, in correspondence with the two great cavities of the trunk in which it is situated.The descending thoracic aorta is located in posterior mediastinum.
left artiumRight artirumleft ventricleRight ventricle
The heart is a four-chambered muscle, whose sole task is to pump blood around the body.