Adaptation for sedentary existence in plants leads to the development of specialized tissues for anchorage, nutrient absorption, and photosynthesis, whereas adaptation for active locomotion in animals necessitates complex organ systems for movement, sensory perception, and efficient energy utilization.

Tissues, which are groups of cells with similar structure and function, are more intricately organized and diversified in complex animals to support their specialized organ systems, whereas in plants, tissues primarily serve functions related to growth, support, and nutrient transport.

The diverse feeding methods and active locomotion of animals necessitate highly specialized and localized organ systems to fulfill various physiological functions efficiently.

Animals, with their active locomotion, require organ systems tailored for mobility and rapid responses to stimuli, whereas plants, with their sedentary existence, prioritize structures suited for nutrient absorption, photosynthesis, and structural support.

Complex animals exhibit a higher degree of specialized and localized structural organization within organs and organ systems compared to complex plants.