1 Coelomate animals or Coelomata (also known as eucoelomates â true coelom) have a fluid filled body cavity called a coelom /ËsiËlÉm/ with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers).he coelom allows muscles to grow independently of the body wall â this feature can be seen in the digestive tract of tardigrades (also known as water bears) which is suspended within the body in the mesentery derived from a mesoderm-lined coelom.
At a 3 percent growth rate, its doubling time â or the number of years to double in size â is 23 years. (The doubling time for a population can be roughly determined by dividing the current growth rate into the number 69. Therefore, 69/3=23 years. Of course, if a population's growth rate does not remain at this rate, the projected doubling time would need to be recalculated.)
On average babies double their birth weight by 4 months; triple their birth weight by 12 months and will be around four times their birth weight by 2 years. (Some babies will reach these levels at a much younger age. Some at a much older age. The most rapid period of growth is between 2 weeks and 6 months of age. This rate of growth decline slightly at around the age of 6 month; declines further around 9 months and declines further still at around 12 months. (These ages can vary depending on each individual baby.)