that they will change over time and adapt to new envirments
Because they need to make a cell a haploid cell which only has half of the total number of chromosomes.
The answer is B. A chemical reaction consists of an endothermic stage (energy taken in to break chemical bonds) followed by an exothermic stage (energy released as bonds are formed). The first stage requires this energy input, which is the activation energy. When the activation energy is reached or exceeded, the reaction will occur. Therefore as soon as this threshold is REACHED, it happens
Floods (when it rains a lot, rivers tend to keep rising which leads to flooding )
