The Round Island boa is a highly threatened snake species. It is native to Mauritius and its surrounding islands. The diagram shows the food web on one of these islands: 
How many secondary consumers are in this food web?
Feral cats are described as both predators and competitors of Round Island boas. Explain why.
Biomass is lost as it passes through this food web. Identify two processes from the list below that result in biomass loss from this food web: egestion, growth, photosynthesis, respiration.
Feral cats were originally introduced to the main island by humans to control pest rodent populations. Which term describes this type of pest control? Choose from: Abiotic control, Biological control, Chemical control, Genetic control.
Female feral cats can breed 2 times each year and produce 4 kittens each time. The Round Island boa lays about 4 eggs each year. Explain why the feral cats can rapidly drive the boa towards extinction.
By the late 20th century, the Round Island boas survived only on a small predator-free offshore island. Scientists proposed building a landing platform and eco-tourist path on this offshore island.
Suggest why these snakes survived on the offshore island.
Suggest two reasons why scientists are against the proposal to build the landing platform and path.