The figure shows some of the organisms that make up a food web in a pond.
How many omnivores are there in this food web?
How many links are there in the longest food chain in this web?
Which organism will decrease in numbers most rapidly if many of the pike are removed by fishing activities?
Which organism in the food web is most likely to be poisoned by insecticide that has been sprayed on farmland and then washed into the pond?
Which of the following substances is passed along the food chain and can poison the top predators?
The figure shows a food chain.
What would happen to the snake population if the eagle population suddenly decreased due to disease?
What would happen to the mouse population if the eagle population suddenly decreased due to disease?