The endosymbiosis theory explains the origins of organelles such as mitochondria and chloroplasts in eukaryotic cells. The theory proposes that chloroplasts and mitochondria evolved from certain types of bacteria that eukaryotic cells engulfed through endophagocytosis.any instances of endosymbiosis are obligate; that is, either the endosymbiont or the host cannot survive without the other, such as the gutless marine worms of the genus Riftia, which get nutrition from their endosymbiotic bacteria.
Rational Emotive & Cognitive-Behavior Therapy. REBT is the pioneering form of cognitive behavior therapy developed by Dr. Albert Ellis in 1955. REBT is an action-oriented approach to managing cognitive, emotional, and behavioral disturbances.According to REBT, it is largely our thinking about events that leads to emotional and behavioral upset.EBT is an action-oriented approach to managing cognitive, emotional, and behavioral disturbances. According to REBT, it is largely our thinking about events that leads to emotional and behavioral upset.
Albert Bandura integrated these two theories and came up with four requirements for learning: observation (environmental), retention (cognitive), reproduction (cognitive), and motivation (both). This integrative approach to learning was called social learning theory.