Combined Science: Trilogy 8464: B6.Inheritance, Variation and Evolution Topical Past Paper Questions

Rat populations can increase rapidly. When rat populations are large there is competition between rats. 1 When rats compete, the basal metabolic rate of the rats increases. Basal metabolic rate is controlled in the same way in humans and in rats. Describe how basal metabolic rate…

Sea lice are small animals that feed on the skin and blood of salmon fish. Figure 3 shows sea lice attached to the skin of a salmon, Oncorhynchus keta. Figure 3 1 What is the genus name of salmon? [1 mark] 2 Which domain are sea lice classified in? 3 Some salmon have genes that r…

The polar bear is a mammal that lives in arctic habitats. 1 Complete Table 2 for the classification of the polar bear, Ursus maritimus. [2 marks] Table 2 Scientists have been measuring the area of sea ice in the Arctic since 1980. Figure 5 shows the area covered by sea ice every…