Dagestan  ·  Dagger  ·  Dagon  ·  Dam  ·  Damage  ·  Damn & Damnation  ·  Dance & Dancer  ·  Danger & Dangerous  ·  Daniel (Bible)  ·  Daoism & Taoism  ·  Dare  ·  Dark & Darkness  ·  Dark Ages  ·  Dark Energy  ·  Dark Matter  ·  Darts  ·  Darwin, Charles  ·  Data  ·  Date (Romance)  ·  Date (Time)  ·  Daughter  ·  David (Bible)  ·  Dawn  ·  Day  ·  Dead & Death (I)  ·  Dead & Death (II)  ·  Dead Sea Scrolls  ·  Deal  ·  Death Penalty & Death Sentence  ·  Debate  ·  Deborah (Bible)  ·  Debt  ·  Decadence  ·  Decay  ·  Deceit & Deception  ·  Decency  ·  Decision  ·  Deconstruction  ·  Deed  ·  Defeat  ·  Defect  ·  Defence & Defense  ·  Definition  ·  Deformity  ·  Déjà Vu  ·  Delaware  ·  Delay  ·  Delusion  ·  Dementia  ·  Democracy (I)  ·  Democracy (II)  ·  Democrats & Democrat Party  ·  Demon  ·  Demonstrations  ·  Denmark & Danes  ·  Dentist & Dentistry  ·  Denver & Denver Airport  ·  Deny & Denial  ·  Depart & Leave  ·  Depression  ·  Descendant  ·  Desert  ·  Design  ·  Desire  ·  Despair & Desperation  ·  Despot & Despotism  ·  Destiny  ·  Destroy & Destruction  ·  Detective  ·  Detention  ·  Determination  ·  Detox  ·  Detroit  ·  Development  ·  Devil  ·  Diamond  ·  Diana, Princess  ·  Diary  ·  Dictator & Dictatorship  ·  Dictionary  ·  Diego Garcia  ·  Diet  ·  Difference & Different  ·  Dignity  ·  Diligence & Diligent  ·  Dimension  ·  Dinner  ·  Dinosaur & Dinosaurs  ·  Diplomacy & Diplomat  ·  Dirt  ·  Disability  ·  Disappearances & Vanishings (I)  ·  Disappearances & Vanishings (II)  ·  Disappointment  ·  Disaster (I)  ·  Disaster (II)  ·  Disbelief  ·  Discipline  ·  Disco  ·  Discovery  ·  Discretion  ·  Discrimination  ·  Disease  ·  Disgrace & Dishonour  ·  Disguise  ·  Disney  ·  Dispute  ·  Dissent  ·  Diversity  ·  Divide & Division  ·  Divine & Divinity  ·  Diving  ·  Divorce  ·  DMT (Dimethyltryptamine)  ·  DNA  ·  Do & Done  ·  Docks & Dockers  ·  Doctor  ·  Doctrine  ·  Documentary  ·  Dog  ·  Dogma  ·  Dogon  ·  Dollar & Dollar Bill  ·  Dolphin  ·  Domestic Violence  ·  Dominican Republic  ·  Donkey  ·  Door  ·  Doping  ·  Doubt  ·  Dowsing  ·  Dracula  ·  Dragon  ·  Dragon's Triangle  ·  Drama  ·  Drawing  ·  Dream  ·  Drink  ·  Drone  ·  Drown & Drowning  ·  Drugs (I)  ·  Drugs (II)  ·  Drugs (III)  ·  Druids  ·  Drunk  ·  Dubai  ·  Dublin  ·  Duck  ·  Duel  ·  Dull  ·  Dust  ·  Duty  ·  Dwarf & Dwarfism  ·  Dzopa & Dropa  

★ Diversity

Because of cyanobacteria life was able to diversify and become more complex very rapidly.  The Universe s1e6: Spaceship Earth, History 2007