Specific gravity measures the kidney's ability to concentrate or dilute urine in relation to plasma. Because urine is a solution of minerals, salts, and compounds dissolved in water, the specific gravity is greater than 1.000. The more concentrated the urine, the higher the urine specific gravity. An adult's kidneys have a remarkable ability to concentrate or dilute urine. In infants, the range for specific gravity is less because immature kidneys are not able to concentrate urine as effectively as mature kidneys.
For the animated series, see Creepy Crawlers (TV series). Creepy Crawlers (or Thingmaker) is an activity toy made by Mattel, beginning in 1964. The toy consists of a series of die-cast metal molds resembling various bug-like creatures, into which is poured a liquid chemical substance called Plastigoop, which comes in assorted colors. The mold is then heated to about 390 Â°F (199 Â°C) on an open-face electric hot plate oven.
We found 51 items. Bugs are fascinating creatures. Explore all sorts of creepy crawlers with insect lessons, printables, and quizzes for elementary, intermediate, and secondary school students. You'll find a variety of cross-curricular activities on these invertebrates that connect science with art, math, language arts, and social studies.