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Cells
Cell structure
Cell functions
Diffusion
Osmosis
Cell division
Mitosis
Meiosis
Organisms
Classification
Tissues
Organs
Systems
Receptors
Senses
Life cycles
Processes
Biochemistry
Enzymes
Word and chemical equations
Energy transfer
Nutrition
Digestion
Transport and circulation
Gas exchange
Transpiration and translocation
Tropisms
Metabolism
Photosynthesis
Cell respiration
Homeostasis
Hormones
Evolution
Unity and diversity
DNA
Reproduction
Inheritance and variation
Natural selection
Speciation and extinction
Genome mapping and applications
Interactions with environment
Habitat
Ecosystem cycles
Habitat change or destruction
Pollution and conservation
Overexploitation
Mitigation of adverse effects
Interactions between organisms
Food chains and webs
Interdependency
Competition
Predator–prey
Pathogens and parasites
Human interactions with environments
Human influences
Vaccination
Factors affecting human health
Biotechnology
Genetic modification
Cloning
3D tissue and organ printing
Gravitropism (Geotropism)
Growth in response to gravity.
Phototropism
Growth toward or away from light.
Tropism
A directional growth response to a stimulus, either toward it (positive) or away from it (negative).