B. Because of the presence of hydrogen sulphide in Brass, it combines with oxygen in air and form water, evaporates. So remained sulphide is colourless in air .So Brass gets discoloured in the air.
the basic unit of life is the cell
Answer:
More than 7000 chemicals are present in tobacco smoke.
Explanation:
In these 7000 chemicals, 250 are harmful to the human body such as carbonmonoxide, ammonia and hydrogen cyanide etc. There are some chemicals that are found in tobacco smoke which causes cancer disease in human. About 69 chemicals out of 250 are present in tobacco smoke that causes cancer disease. So its consumption is dangerous for health.
Both, actually. They both add up to 46 chromosomes. If you have less than 46, you will come out with Autism. Hope this helps!
Because the energy is going to decrease to also nothing and the animals at the top have to hunt more than those closer to the bottom of the food web
