Species are generally defined as specific kinds of plants and animals that reproduce their own kind and that do not interbreed with other species in natural environments. Plant and animal species do not exist in a vacuum. They interact with other species and the environment. The basic unit for measuring a species is its population (How many are there?). In a stable ecosystem, the population of each species is in balance. Example: birds have enough seeds to eat and there are enough seeds left over to sustain the plant species that made the seeds.
This lesson explores some basic ideas about species, populations, and the factors that determine whether or not they are in balance.
After completing this lesson, each student should be able to:
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