legume taxonomy, nodule morphology and structure, legume flowers, evolution of nodulation, rhizobial diversity, nitrogen fixation, ammonia factories, terminally differentiated bacteroids, Tissues, Photosynthesis, Ecosystems, Cells, Heavy metals, Bacteroids, Tropical regions, Agricultural production, Climatic changes, Arid environments, Biological diversity,...
Automobiles, Environmental aspects., Greenhouse effect, Atmospheric., Transportation, Automotive, Motors, global warming, Greenhouse gases
Environmental aspects, Environmental protection, Sustainable development., Greenhouse effect, Atmospheric., Automobile driving, Commuting, Automobile industry and trade, Citizen participation