Download e-book for kindle: Alfred Wegener. Uncovering Plate Tectonics by Greg Young

By Greg Young

During this beautiful biography, young ones will examine the interesting lifestyles, theories, and discoveries of Alfred Wegener. From his time in Greenland learning meteorology with sizzling balloons to his concept of Pangea, readers can be wanting to study extra approximately Wegener's contributions to technological know-how and the strides he took in the direction of constructing the examine of plate tectonics. The easy-to-read textual content, obtainable word list, invaluable index, and exciting proof paintings together with the vigorous photos and eye-catching lab job to have interaction readers from starting to end!

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Lungs are composed of smooth, shiny lobes. Lungs Can Float in Water Lungs are the only organ in the human body that can float in water. 31 Trachea, Bronchi, and Alveoli T he trachea is a pipe that connects the mouth and nose to the lungs. It is also known as the windpipe. Bronchi are the divisions of the trachea that lead to each lung. Each bronchus (singular of bronchi) is further subdivided into several branches that terminate into tiny air sacs called alveoli. 2 mm. Structure of Trachea The trachea is flexible, stretching to between 4 and 5 inches long and about one inch in diameter.

DNA testing is even more reliable because apart from identical twins, no two individuals can have same set of DNA. Mode Methods of DNA testing are RFLP analysis, AmpFlp analysis, STR analysis, Y-chromosomes analysis, and mitochondrial analysis. • The most popular ancestry tests are Y-chromosome (Y-DNA) testing and mitochondrial DNA (mtDNA) testing. • Mitochondrial DNA is a DNA in the human passed down to the child by the mother without any change. • A person’s maternal ancestry can be traced using his or her mitochondrial DNA.

The average life span of a sperm is about 36 hours. • The male organs produce and transfer sperm to the female for fertilization. • Testicles produce and store millions of sperm cells. • Testosterone is the hormone that causes males to develop deeper voices, bigger muscles, and body and facial hair, and it stimulates the production of sperm. Female Reproductive System T he female reproductive system is a group of organs that are necessary for reproduction. It includes ovaries, fallopian tubes, uterus, and vagina.

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Alfred Wegener. Uncovering Plate Tectonics by Greg Young

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