Natural Selection

Which of these is an example of natural selection?

• The largest animal in a population will have more opportunities for reproduction.
• Several species of organisms work together so that they all succeed.
• One species takes all the resources in an environment leaving none for others.
• Organism that are best suited to an environment tend to survive and reproduce more often.

Humans have been a very successful species on earth.  They have very large, very diverse populations spread all around the world. As a result,

• Human have very limited ability to adapt to changes in the environment.
• Young humans have lower survival rates as compared to other species.
• Humans have a potential to adapt to various environmental changes.
• All humans are more disease resistant.

Which of the following explains adaptation.

• An individual organism changes to meet its needs in the environment. These changes pass down to their offspring.
• The species as a whole changes their characteristics.
• Beneficial traits allow organism to survive and pass on those traits
• New characteristics arise in a species as needed.  If these traits are helpful, they are passed down.

When an environment changes faster that an species can adapt, the most likely outcome is...

• ...biological evolution.
• ...voluntary mutation
• ...species extinction
• ...selective breeding

What is not a selective pressure?

• Competition

• Abiotic agents

• Biotic agents

• Probiotic agents

Evolution works by 

• individuals changing to suit their environment
• Individuals learned new traits and pass them on
• sudden change in the environment cause a species change 
• small changes pass down through many generations

Why is it beneficial for a species to have varying traits?

• They can't be seen by predators

• It is helpful in asexual reproduction

• If the environment changes, the population might be better able to adapt

• They don't recognize each other.

Mutations happen

• when the environment changes

• when the animal needs to adapt

• at random

• after adaptation

What is not true of Variation in natural selection?

• Variations can be both favourable and less favourable

• Individuals in a population are usually different from each other in some way

• Variations can provide an competitive advantage over other variations in a particular environment

• It is possible for less favourable variations to thrive

In recent years "SuperBugs" (bacteria that aren't effected by antibiotics) are becoming more and more common. How could natural selection explain this?

• Superbugs survive antibiotics through resistance and reproduce

• Antibiotics cause bacteria to become superbugs that are resistant

• We have always had the same amount of superbugs; modern media just discusses them more.
• There is no reliable data on the origin of super bugs.