Question

justify though the variations are more between the organisms they might have been evolved from common ancestor

Answer 1

Evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs. Biological populationsevolve through genetic changes that correspond to changes in the organisms' observable traits. Genetic changes include mutations, which are caused by damage or replication errors in organisms' DNA. As the genetic variation of a population driftsrandomly over generations, natural selectiongradually leads traits to become more or less common based on the relative reproductive success of organisms with those traits.

The age of the Earth is about 4.54 billion years. The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago.Evolution does not attempt to explain the origin of life (covered instead by abiogenesis), but it does explain how early lifeforms evolved into the complex ecosystem that we see today. Based on the similarities between all present-day organisms, all life on Earth is assumed to have originated through common descent from a last universal ancestor from which all known species have diverged through the process of evolution.

All individuals have hereditary material in the form of genes received from their parents, which they pass on to any offspring. Among offspring there are variations of genes due to the introduction of new genes via random changes called mutations or via reshuffling of existing genes during sexual reproduction. The offspring differs from the parent in minor random ways. If those differences are helpful, the offspring is more likely to survive and reproduce. This means that more offspring in the next generation will have that helpful difference and individuals will not have equal chances of reproductivesuccess. In this way, traits that result in organisms being better adapted to their living conditions become more common in descendant populations.These differences accumulate resulting in changes within the population. This process is responsible for the many diverse life forms in the world.

Answer 2

Explanation:

Evolution is the gradual change in living organisms over time.

Some organisms are from same ancestry but due to evolution they have different structures.

These changes occur due to change in environment.

As organisms move and live in different environments they develop features which are suitable for the environment they live in.

Some of the features become extinct since they are not necessary in the given environment.

This makes organisms from common ancestry to look different.