3. Charles Darwin is well known for his theory of evolution by natural selection, but this theory was actually independently discovered by another scientists around the same time. What is the name of that person? You may answer with only the first name or the second name, or you can give both names (i.e. two words maximum) - do not include a period at the end of your answer.

(a)  

6. Natural selection can also be described as "Survival of the (a)   ". What is the missing word? Type your answer as a single word with no period at the end.

9. A characteristic that enables an organism to survive in its environment is called a/an (a)   ". What is the missing word? Type your answer as a single word with no period at the end.

13. Genetic drift is another method by which evolution can occur. There are two main examples of this. If a small proportion of the population moves to a new geographical area and establishes a new population, it may not be representative of the original population, resulting in a change in allele frequencies. This is known as the " (a)   " effect. What is the missing word? Type your answer as a single word with no period at the end.

14. Another example of genetic drift is when a large proportion of the population is lost, e.g. through natural disaster. The surviving population may not be representative of the original population. This is known as the " (a)   " effect. What is the missing word? Type your answer as a single word with no period at the end.