Answer:
natural selection
Explanation:
According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
The exact reproduction of an individual from cellular tissue is called cloning.
Cloning is a scientific technique that is used to produce identical copies of an individual having similar genetic information.
In this process, a complete cell, tissue, gene, even an entire organism can be cloned.
A clone can be produced either by artificial or natural methods.
In nature, some unicellular organisms such as bacteria produce multiple copies of themselves by means of asexual reproduction.
The first ever human clone was named Eve in December 2002.
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Alveoli are found in lungs and exchamge O2 and Co2 !!
so answer is last one !!