Four species of small mammals live in the same British woodland:
- Yellow-necked mouse (Apodemus flavicollis\textit{Apodemus flavicollis}Apodemus flavicollis)
- Wood mouse (Apodemus sylvaticus\textit{Apodemus sylvaticus}Apodemus sylvaticus)
- Harvest mouse (Micromys minutus\textit{Micromys minutus}Micromys minutus)
- Hazel dormouse (Muscardinus avellanarius\textit{Muscardinus avellanarius}Muscardinus avellanarius)
Which two species of mammals do scientists classify as being most closely related? Give a reason for your answer.
What is the biological definition of a species that explains why the yellow-necked mouse and the wood mouse are classified as separate species?
The populations of four rodent species (WWW, XXX, YYY, and ZZZ) in this woodland were monitored over one calendar year.
Using this information: Describe how the population of species WWW changes during the year.
In June and July, a disease affected the populations. Which species (WWW, XXX, YYY, or ZZZ) had the lowest resistance to this disease? Give a reason for your answer.
One of the species is a migratory species that only lives in this woodland during the warmer months of the year. Identify this species and support your answer with evidence from the graph.