In the prairie there are many kinds of grasses and other plants that are eaten by grasshoppers and other insects, prairie dogs, and bison. In turn there are many birds that feed on the insects and some hawks that feed on the prairie dogs. The birds use the grasses to build their nests, and bison prefer to feed in areas where prairie dogs have kept the grass short. This is a simplified example of:.
A) an ecosystem.
B) a community.
C) a niche.
D) abiotic factors

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind

Me brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula.5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects.8. describe the planets’ orbits around the sun.9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets.13. what causes the seasons?

Which of the following human activities resulted in the growth of the north american deer population?