• Ecology: study of interaction of organisms with their environment, both abiotic and biotic • Human population growth: hunter-gatherer, agricultural, industrial • Ecosystems are determined by vegetation (grassland, shrubland, forest) • Aquatic ecosystems are determined by depth, flow, or salinity (freshwater, marine, stream, lake, sandy beach, rocky shoreline) • Rubisco is the enzyme that catalyzes photosynthesis • Particles diffuse down the concentration gradient in stomatas; equilibrium never achieved but consistent gradient keeps for CO2 readily entering stomatas • Rate at which CO2 enters is function of density and size of opening • Saturation vapor pressure: max amount of water that can be held in a given volume of air; it is a function of air temperature • Relative Humidity: Actual V.P. / Saturation V.P. * 100% • Factors affecting rate of photosynthesis: Light, Nitrogen, Temperature, and Water (water and temp are related because the temp of the air influences relative
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