【正文】
pictures of the body tissue layer by layer. 7. Cloning is a technique of producing a copy of an anism without sex。 by replacing nucleus of an egg with the nucleus of a body cell from the anism. 8. Acupuncture is a Chinese medical practice of piercing parts of the body with needles to treat disease or relieve pain. 9. Bacteria are onecelled microanisms that can be seen only under a microscope. They have no chlorophyll, and multiply by simple division. 10. Virus is a kind of anism that is too small to be seen under an ordinary microscope