Which statements are true? Explain why or why not.1 In the small intestine, stem cells in the cryptsdivide asymmetrically to maintain the population of cellsthat make up the villi; after each division, one daughterremains a stem cell and the other begins to divide rapidlyto produce differentiated progeny.2 Stem cells, being stem cells, are by definition thesame in all tissues.3 Every tissue that can be renewed is renewed froma tissue-specific population of stem cells.4 Disturbance of the balance in the activities ofosteoblasts and osteoclasts in favor of osteoclasts cangive rise to the condition known as osteoporosis, the brit-tle-bone syndrome of the elderly.

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Tissue renewal

In multicellular organisms, tissue is a level of structure that consists of a group of physically and functionally identical cells and their intercellular substances. Unicellular organisms do not have tissues. Tissues are absent or poorly differentiated even in the simplest multicellular animals, such as sponges. However, more evolved multicellular animals and plants have specialized tissues that may organize and govern an organism's reaction to its surroundings. The word tissue is derived from the Latin word 'weave.' Plants and animals have various kinds of tissue systems that differ in their work and composition according to the different requirements.