Evolution Test - 20

Human races are subdivisions of a single species, therefore they are capable of interbreeding.

Jurassic is a geological period which is marked by the evolution of first bird from the theropod dinosaurs. 

Mutations are the raw materials of evolution. Evolution absolutely depends on mutations because this is the only way that new alleles and new regulatory regions can be created.

Proterozoic era is the time when life came on earth and there were evidences of life on earth, this includes the formation of cellular structures and less complex organisms

The birds and mammals evolved during the Coenozoic (new life) era. The decline of reptiles allowed diversification of birds and mammals.

Darwin finches occupy different niche with in the same geographical area and the distribution is primarily decided by the differences in diet of birds.

Solution:

• Correct answer is option A.
• Explanation for correct option:
• An eon is the largest timespan in the geological timeline. An eon is subdivided into eras.
• The Azoic Era was the oldest and long-lasting stage in the development of earth. There was no evidence of life in this era.
• The Azoic era is the era when origin of the continental shelf occurred. 
• The continental shelf (Pangaea) was formed by the silica rich granite rocks of less density.

We find that all

organisms have certain key metabolic pathways in common. This proves that all

organisms existing today could be evolved from a common ancestor. The genetic

code, the correlation between each amino acid, and the DNA/RNA base triplet

also encodes is common to all organisms existing today.

 

Thus, life could have began

the amino acid level.

According to Darwin, Marsupials were considered inferior with respect to placentals. These species thrived where there was no competition or in other words in the absence of natural selection. Marsupials existence in Australia and New Zealand gives us clue about the geological period and we get evidence that these continents were joined long ago. As per continental drift theory around 30 to 40 million years ago, South America and Australia were joined in the Southern hemisphere and it is believed that marsupials could have migrated between these islands which proves both the continental drift and the related geological period.