GENERAL GEOLOGY

Detailed explanation-1: -Some variations increased their survival and allowed them to have more offspring. Over generations those advantageous variations would become more common-would, in a word, be “selected.” As new variations emerged and spread, they could gradually tinker with anatomy, producing complex structures.

Detailed explanation-2: -Although there has been an increase in the maximum level of complexity over the history of life, there has always been a large majority of small and simple organisms and the most common level of complexity appears to have remained relatively constant.

Detailed explanation-3: -As described by Darwin, evolution occurs by a process called natural selection. In natural selection, some members of a species, being better adapted or suited to their environment, produce more offspring than others, so they pass “advantageous traits” to their offspring.

Detailed explanation-4: -Study suggests complex life was present on Earth 2.33 billion years ago. New estimate predates earliest fossil evidence by 800 million years.