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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What is the difference between sex-linked traits and autosomal traits in humans? a. sex-linked traits can only be passed from fathers to sons, while autosomal traits can be passed on from both parents to offspring of any sex. b. sex-linked traits are passed on through the x and y chromosomes, while autosomal traits are passed on through the other 22 chromosomes. c. sex-linked traits only affect females, while autosomal traits affect both males and females. d. sex-linked traits refer to genes that are on the x and y chromosomes, while autosomal traits refer to genes on all 23 chromosomes.