Respuesta :
Primary productivity in aquatic ecosystems is determined by measuring the uptake and release of carbon dioxide. Â
• The rate at which energy is transformed to organic substances by photosynthetic producers  that obtain energy and nutrients by using sunlight is termed as primary productivity. Â
• The total amount of biological productivity in an ecosystem is known as the gross primary productivity. Â
• The community of plants and animals, which live in, on or close to water is known as the aquatic ecosystem. Â
• In an aquatic ecosystem, the primary productivity is generally determined by measuring the release and uptake or carbon dioxide. The production rates are generally articulated in terms of grams of carbon per unit area per unit time. Â
Thus, correct answer is statement b.
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