Discuss how classification systems have undergone several changes over a period of time?

Why are the classification systems changing every now and then?

During the summer, the level of water in a pond decreases by 2 inches every week due to evaporation. What is the change in the level of water over a period of 6 weeks?

Assume that the rate at which radioactive nuclei decay is proportioanl to the number of such nuclei that are present in a given sample. In a certain sample 10% of the original number of radioactive nuclei have undergone disintegration in a period of 100 years. What percentage of the original radioactive nuclei will remain after 1000 years.?

___changes which take place within a short period of time.

Assertion : Water hyacinth is an invasive aquatic plant which speads all over the water in a short period of time. Reason : Water hyacinth can reproduce vegetatively.

Energy resources can be renewed over a short period of time is known as _______ .