Question

What is meant by '' accumulation of changes in the body designs of ancient organisms ''?

Answer 1

The organisms show changes in their physical attributes and genetic make up due to many reasons such as

1. variation due to sexual reproduction
2. change in genetic material due to mutation
3. adaptation

when an organism reproduces it passes these changes in the future generations. And the next generation passes its changes along with the previous changes onto the new generation. Over many generations these changes keep on collecting leading to a marked difference in the organisms of current age from the ancient times, particularly in body design.