Question

Give example to explain that evolution has taken place in stages not by a single dna change?

Answer 1

If we see the fossils of a particular animal, we could see that evolution is a gradual process. The fossils of all animals and plants in different time periods show only a slight morphological, anatomical and physiological changes. If evolution is just by a single DNA change, fossils wouldn't be existed like that.

Answer 2

$\Huge{\sf Evolution }$

• Evolution is the gradual and slow adaptation of organisms to changing environment

• As the time flew,the complexity of life only increased.

For example,

• The first organisms didn't have a fully functioning and complex brain rather it was first a single nerve,then a nerve ganglion and evolved into brain as we know it now

Similarly,

• The eyes was just a group of photosensitive cells but not it's a complex organ.

This change hasn't been an overnight process but an outcome of many years of evolution