Primary succession occurs when pioneer species move into an area that has no plants. Which organisms are common pioneer species?
A Conifer trees and tall grasses with roots that loosen the soil
B Mosses and lichens that can grow on rocky surfaces
Grasses and weeds that arrive as seeds carried by the wind and then germinate in rich soil
D Vines and shrubs that help prevent the erosion of shallow soil

At which location in earth’s interior does the top density continue to increase as thickness decreases?

In general, are there any major differences that you can see? explain

Try to answer all questions if possible i will take anything this is worth 21 ! ! 1. what rights do citizen's have in a monarchy? 2. what countries practice monarchy? 3. what is one advantage of a monarchy? 4. what is one disadvantage of a monarchy? 5. what rights do citizen's have in a dictatorship? 6. what countries practice dictatorship? 7. what is one advantage of dictatorship? 8. what is one disadvantage of dictatorship?