How many species of finches were observed by Darwin on the Galapagos?

______________ is a force that causes groups of organisms to change over time.

• A group of organism changes overtime because of variations.
• These variations are caused during sexual reproduction.
• Changes are also caused by mutations. These are sudden changes that are caused on genetic level. 
• So, all these changes caused in a group of organisms are developed in next generations only if these are helpful for them to survive in the changing environment.
• This is called adaptation. Only such changes are developed in generations of organism that helps them to evolve.
• So, nature selects only those who can survive better in the changing environment. This is called natural selection.
• This concept was given by scientist Charles Darwin. So, natural selection acts as a force that causes group of organisms to change overtime.

In this case if the surface was a sand hill instead of a rocky mountain which mice population would survive better?

Who is considered as the “Father of evolution”?

Tortoises with saddle-shaped shells have shorter necks as they feed on grass.  

Artificial selection is used to produce organisms with:

Darwin published his theory of evolution in his book named:

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

Changes caused by the environment in the phenotype are not significant in the process of evolution of new species because:

The deer mouse in sand hills of Nebraska are ___________ in color.

Match the following:

a. Dome - shaped tortoise	1. Hood Islands
b. Saddle - shaped tortoise	2. Pinta Islands
c. Intermediate - shaped tortoise	3. Isabela Islands

­­­Darwin studied which bird species on the Galapagos Island?

Charles Darwin is best known for:

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

Which of the following environmental factors can affect the size of a population?