• [History of life: Grades 9-12] Present-day species evolved from earlier species; the relatedness of organisms is the result of common ancestry. (LS4.A)
• [History of life: Grades 13-16] Present-day species evolved from earlier species; the relatedness of organisms is the result of common ancestry.
• [History of life: Grades 3-5] Present-day life forms are related to past life forms. (LS4.A)
• [History of life: Grades 6-8] Through billions of years of evolution, life forms have continued to diversify in a branching pattern, from single-celled ancestors to the diversity of life on Earth today.
• [History of life: Grades 6-8] Present-day life forms are descended from past life forms; all life is related. (LS4.A)
• [History of life: Grades 9-12] Through billions of years of evolution, life forms have continued to diversify in a branching pattern, from single-celled ancestors to the diversity of life on Earth today.
• [Studying evolution: Grades 6-8] Evolutionary relationships may be represented by branching trees (i.e. phylogenies or cladograms).
• [Studying evolution: Grades 13-16] Evolutionary trees (i.e., phylogenies or cladograms) portray hypotheses about evolutionary relationships.

• Disciplinary Core Idea LS4.A: Evidence of Common Ancestry and Diversity

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