Tortoises with dome-shaped shells have shorter necks because:

Darwinism cannot explain?

Natural selection favored darker moths to survive in industrial areas because?

What of the following is NOT a postulate of Darwin’s theory of evolution?

The traits that are most useful for survival in an environment become more common through the process of ____________.

Darwin’s finches show variation in their __________.

Darwin’s theory is also known as:

Which of the following concepts is proposed by Charles Darwin?

Which of the following environmental factors affects the number of individuals in a population?

Adaptations are traits that _________________.

Natural selection:

Evolutions states that all organisms are evolved from a __________ ancestor.

The passing of genes to an organism that is not an offspring is called ___________.

Natural selection:

___________ is the driving force of evolution.    

• The changes can occur in many forms.
• With time small changes occur in the organism and these make them different than other animals of the same category. Thus variations occur. 
• Mutations are sudden changes that occur at the molecular level, it changes the genome of an organism.
• Sexual reproduction is also a source of change. As it also causes variations in offspring's. At the time of gamete formation some changes occurs due to recombination.
• So, among all the changes that occurs with time only those will develop that help the organism to remain alive.
• This is called natural selection.

Tortoises with dome-shaped shells have shorter necks because:

• Dome shaped tortoises are larger.
• These have shorter neck because these feed on the vegetation that is closer to the ground.
• So, they are able to eat with shorter neck.