Explanation:
● Urbanization is the natural
phenomenon of large population immigrates to one town gradually and continually over a period of time. Due to rapid development in the country the industrial and political centers are getting urbanized. The policies of liberalization have too encouraged it. Urbanization is good for the economy as it increases. However, rapid growth causes congestion and pollution too.
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Lichens are organisms made of two different species, algae and fungi, lifing together in a symbiotic relationship.
The phenomenon is tolerance.
Tolerance can be found in many aspects of physiology,
For example, when you feel a pain somewhere due to touching something sharp, the feel will be less intense when you feel it the next times.
When you eat a lot of sweets, you tung will temporarily lose its ability to feel sugars
Another example in pharmacology, when you drug in a chronic way, its effect will decrease.
Answer:
Cause they are Metals that there weight is tons
Explanation: