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The choroid, ciliary body, and iris taken together. varves In geological formations, annual alternating layers caused by seasonal variation.
vertebrae (also vertebras, sing vertebra) /VERT-ə-bree or -bray, sing: VERT-ə-brə/ n. CRANIAL VIEW OF HUMAN VERTEBRA | LATERAL VIEW OF HUMAN VERTEBRA vertebral canal /VERT-ə-brəl/ n.
The longer of the two bones of the forearm; it connects with the wrist on the side away from the thumb. An undulipodium contains cytoplasm and a ropelike structure composed of microtubules known as an axoneme. The half-life of U-238 is about 4.47 billion years and that of U-235 is 704 million years, which make them useful for dating geological strata (the methods used for this purpose are uranium-thorium dating, uranium-lead dating, and uranium-uranium dating). It is the primary nitrogenous component of urine in mammals and amphibians. It holds and nourishes the developing embryo and fetus.
PICTURE OF CARROT UMBEL umbilicus /əm-BILL-ik-əs/ n. A movable, whiplike extension of the plasma membrane of certain eukaryotic cells, such as spermatozoa. A fatty acid with at least one double bond joining the carbons in its hydrocarbon tail. One of the four nucleotide bases, a pyrimidine, found in RNA (another pyrimidine, thymine, replaces uracil in DNA). A weakly radioactive chemical element; atomic weight 238.02891; atomic number 92. Uranium decays slowly by emitting an alpha particle. A soluble nitrogenous waste; found in blood and lymph. Some authorities would include all extant bears other than sloth bears in this genus. The organ of gestation, present only in females, commonly known as the womb.
Cells present in blood, also known as leukocytes, that play a role in the immune system. PICTURE1 | PICTURE2 | PICTURE3 xiphocostal /ZĪ-fō-CAWST-əl/ adj.
An extension of the sternum protruding caudally between the two halves of the rib cage. In this method, x-rays are passed through the substance under analysis and then, on the basis of the resulting patterns of diffraction, inferences are made about its structure.