7. Which of the following shows the correct order of stages in the primary succession ? A. bare soil, shrubs, hardwoods, pines
B. shrubs, mosses, pines, grasses
C. rock, grasses, hardwoods, shrubs
D. rock, lichen, mosses, grasses

2. What do scientists mean when they refer to a population?
A. all the organisms in an ecosystem
B. Different species that share similar traits
C. all the animals that acquire resources through similar methods
D. two or more of the same species

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