Here are five statements about natural selection:
1 Individuals within a species show variation.
2 Individuals within a species compete with each other for, among other things, resources.
3 Individuals with advantageous adaptations are more likely to survive to adulthood.
4 Only individuals with advantageous adaptations will be able to breed.
5 Alleles for advantageous adaptations are more likely to be inherited.
Which of the above statements are correct?

Answer:

9) C

1 – All individuals within a species show variation. e.g. All humans have some sort of variation in our genes such, as different eye colour or faces. So 1 is correct.

2 – Competition between individuals within a species is called intraspecific competition (intra=within). e.g. Lions have to compete with other lions for food.

3 – This is true. Let us explain this with an example. Let us take the cubs of a lion. The cubs which are more tolerant of higher temperatures will more likely be able to survive for a longer period of time. On the other hand, if a cub, born with genes which are not tolerant of high temperatures will be more likely to die earlier than the other cubs.

4 – This is not necessarily true. Individuals who have disadvantageous adaptations will also be able to breed. 4 is wrong.

5 – This is true.