Answer:
Explanation: ccccccccccccc
When the condition is acidic the substance that would leached is d.aluminum which is then the most ample element in the earth. Aluminum becomes a big part of one's life. It can be use in one's daily life like a beer can, cables,etc.
Answer:
B. Increased fertility of the land downstream
Explanation:
Dams are constructed across river to prevent water flow they conserve water for human use.
It has both advantages and disadvantages.
Dam are expensive to construct
Dam are used in generating hydropower, for supply of water for domestic use, irrigation,industrial use.
Dams detract from natural settings, ruin nature’s work
Dams leads to extinction of natural habitat, It could result in flood due to over flow, it leads to migration of people out of there homes due to it construction. Construction of dam is unlikely to increase fertility downstream.
Your answers are adenine<span>, thymine, </span>cytosine<span> and guanine</span>