Ecosystems and Population Change

What shapes an ecosystem, how populations are measured, and how they change over time.

9 questions, free, marked as you go with a worked explanation on every one.

What this covers

• population change equation

The questions

1. A survey counts 450 deer in a park of 90 km². What is the population density?
2. A population of 1000 rabbits has 200 births, 50 deaths, 30 immigrants and 80 emigrants in a year. What is the population at the end of the year?
3. What distinguishes primary succession from secondary succession?
4. What is the carrying capacity of an environment?
5. Which of these are density-dependent limiting factors? Select all that apply.
6. Natural selection acts most directly on which of the following?
7. What is an organism's niche?
8. Two species of bird in the same tree feed at different heights and on different insects. What does this best illustrate?
9. Use the table. What is the net change in population size over this period?

Answer these free