Evolutionary Relationships Crossword Puzzle

QUESTIONS LIST:

• endangered : not yet extinct, but close.
• common ancestor : what all species share.
• homologous : similar structures showing common ancestry.
• tetra pod : four-legged animals with common fishy ancestor.
• embryo : stage when we briefly had tails and gills.
• evolutionary tree : graph showing the relationships between species.
• taxonomy : kingdom, phylum, class, order, family, genus, species.
• species : they can have fertile offspring together.
• genus : closely related species.
• homo sapiens : humans.