One fourth means (one half) of (one half) .
So the 18 months must be two half-lifes.
The half-life of this particular isotope is 9 months.
Surface runoff is a term used to describe when soil is infiltrated to full capacity and excess water, from rain, snowmelt, or other sources flow over the land. This is a major component of the water cycle or the hydrological cycle.
Answer:
Any three ways are:
1. Increase in Carbon Dioxide.
2. Loss of both plants and animals.
3. Land slides will take place.
Deforestation affect the world climate by :
1. Averaged over all land and oceans surface.
2. Global warming.
3. Loss of fresh oxygen.e.t.c.
Cell type – prokaryotic or eukaryoticcell structure – cell wallnutrition – autotrophic or heterotrophicbody type – unicellular or multicellular
