- An example of an adaptation that helps a prey species avoid being caught is
- A relationship in which two species live closely together and both benefit is
- The part of an ecosystem where an organism lives and feeds is called the organism's .
- What is the smallest unit of organization in an ecosystem? Give one example from the illustration.
- The main way that populations increase in size is through the of offspring.
- The series of changes that occur in an area where no ecosystem previously existed is called primary succession.
- Nutrients in the soil from decaying remains of animals is a(n) factor of an organism's habitat.
- Bees and flowers are biotic factors in an ecosystem.
- All of the following are examples of limiting factors except
- A hawk building its nest on an arm of a saguaro cactus is an example of
- Population size generally increases if the birth rate is greater than the death rate.
- An insect looks like a leaf, so it blends in with its surroundings and is hard for predators to see. The insect's characteristic is an example of commensalism.
- All the biotic and abiotic factors in an area together make up a(n) .
- A lack of places to build nests is an example of as a limiting factor for a population of birds.
- An ecologist counts 75 cardinals in an area measuring 15 square kilometers. What is the population density of the cardinals?
- Both species benefit in the type of symbiosis called mutualism.
- The first species to populate an area are called primary species.
- Secondary succession is usually slower than primary succession.
- A forest fire is followed by Choose... immediate primary secondary succession.
- If you count 20 beetles in a garden measuring 5 square meters, the population density of the beetles is