Lionfish are a type of fish native to the tropical waters of the Indian Ocean and Pacific Ocean. Lionfish were first reported off the south east coast of the USA in the 1980s. Lionfish are an alien species to this area. Their lack of a natural predator in these waters resulted in their numbers increasing dramatically, allowing them to migrate to new areas. They have now become established across the Caribbean. Their numbers are so high that they are now a threat to many native species.

Section B Answer one question. (a) Explain what is meant by the terms ecosystem and niche.

The aye-aye, Daubentonia madagascariensis, is a primate native to Madagascar. Aye-ayes are nocturnal (active at night...

Fig. 7.1 shows a red deer, Cervus elaphus. Red deer are herbivores that feed on a wide range of plants. [Figure 7.1] ...

Which diagram correctly shows hydrogen bonding between two water molecules? [Figure 13.1]

Which statement describes an example of an extracellular enzyme?

Which row is correct for enzymes that catalyse reactions using the lock-and-key hypothesis?