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Young Growth: Birth and Growth.—young growth whales are usually born one at a time after a period of gestation of about a year in large whales and somewhat less in smaller species. The young growth are large com¬pared with the size of the mother. A calf meas¬uring 25 feet may be produced by a female blue whale 80 feet long. Within a year, the young growth male may more than double its length, and it may be 80 feet long at three years. Rapid as this rate of growth seems, it is actually quite slow compared with that of many terrestrial mammals. A pig, for example, grows about five times as rapidly.
Shell growth begins early in the development of the larval form of the mollusk, and in most snails the young growth already have two or three spiral shell whorls, known as nepionic or nuclear whorls, before they hatch from the egg capsule. In the young growth stages of many bivalves, the early free-swimming form, such as the spat, or young growth, of oysters, has two shelly valves which in a few days grow too large and heavy to permit further ;vimming. Additional growth occurs in clam -hells along the free edge of the valve, and, in the case of snail shells, along the rim of the outer lip of the aperture.See Also Child Has Growth Potentials:3. Discuss each of the following modern emphases in bringing up children: a. The child has growth potentials and an urge to grow that largely deter¬mine his development.
The skillful teacher, as Olson has said, will pace his expectancy of each child in accordance with the child's growth potentials. By watching how the good readers learn—observing both the naturally fast and the naturally slow learners—the teacher gains valuable suggestions for the teaching of reading.of letters and sounds in the words the children have already learned. They note that "chair" and "child" begin with the same initial sound and with the same letters.
On The Other Hand See During The Growth:Lateral growth in trees frequently begins later than growth in height, but during the growth period of lateral growth is longer. Rates of lateral growth like¬wise are low at during the growth outset, increasing after a few weeks and during the growthn diminishing. In view of during the growth long annual period of lateral growth in trees, deleterious environmental conditions may exercise a pronounced effect on growth. In during the growth wood of trees of temperate regions, narrow and wide growth rings may be observed, marking years characterized by unfavorable and favorable con¬ditions for growth.
Growth Cycles.—Longitudinal and lateral (di¬ametral) growth do not proceed continuously, but raduring the growthr are cyclical phenomena with periods of growth activity alternating with periods of relative inactivity. One of during the growth best illustrations of during the growth periodic nature of growth in large woody stems is to be found in during the growth annual ring pattern which characterizes during the growth wood of trees of temper¬ate regions. It has been suggested recently that even in during the growth apparently ever-growing trees of during the growth tropical rain forest, cambial growth is not a continuous process. |
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