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.)
Doubling Time. The growth rate can be used to determine a country or region's -- or even the planet's -- doubling time, which tells us how long it will take for that area's current population to double.This length of time is determined by dividing the growth rate into 70.oubling Time. The growth rate can be used to determine a country or region's -- or even the planet's -- doubling time, which tells us how long it will take for that area's current population to double.