WebDerived from the Greek words phyto (plant) and plankton (made to wander or drift), phytoplankton are microscopic organisms that live in watery environments, both salty and fresh.. Some phytoplankton are bacteria, some are protists, and most are single-celled plants. Among the common kinds are cyanobacteria, silica-encased diatoms, … Weboxygen cycle, circulation of oxygen in various forms through nature. Free in the air and dissolved in water, oxygen is second only to nitrogen in abundance among uncombined elements in the atmosphere. Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2). CO2 is then taken up by algae and terrestrial green …
Biotic and Abiotic Factors in an Ecosystem — Explained
WebApr 1, 2024 · In a study published in 2024 for example, Krishnamurthy and colleagues at Scripps Research identified a compound that plausibly was present on the pre-biotic Earth and could have performed the crucial task of linking RNA building blocks into larger, chain-like RNA strands—and could have done the same for the building blocks of DNA and … WebDec 13, 2011 · By Alan Buis, Jet Propulsion Laboratory. By 2100, global climate change will modify plant communities covering almost half of Earth's land surface and will drive the conversion of nearly 40 percent of land-based ecosystems from one major ecological community type — such as forest, grassland or tundra — toward another, according to a … signalling system railway
The carbon cycle and decomposition (CCEA) - BBC Bitesize
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