This tutorial introduces photosynthesis
Other sections include animal systems, cells, vertebrates, and invertebrates.
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But science is always subject to becoming dogmatic and hypotheses can prevail for reasons of wealth, power, rhetorical skill, and the like, not because they are valid. The history of science is plagued with that phenomenon, and probably will be as long as humanity lives in the era of scarcity.As will become a familiar theme in this essay, the rise and fall of species and ecosystems is always primarily an energy issue. The Ediacaran extinction is a good example: Ediacaran fauna either an energy source for early Cambrian predators, ran out of food energy, ran out of the oxygen necessary to power their metabolisms, or lacked some other energy-delivered nutrient. After the extinction events, biomes were often cleared for new species to dominate, which were often descended from species that were marginal ecosystem members before the extinction event. They then enjoyed a of relative energy abundance as their competitors were removed via the extinction event. For this essay’s purposes, the most important ecological understanding is that the Sun provides all of earthly life’s energy, either (all except nuclear-powered electric lights driving photosynthesis in greenhouses, as that energy came from dead stars). Today’s hydrocarbon energy that powers our industrial world comes from captured sunlight. Exciting electrons with photon energy, then stripping off electrons and protons and using their electric potential to power biochemical reactions, is what makes Earth’s ecosystems possible. Too little energy, and reactions will not happen (such as ice ages, enzyme poisoning, the darkness of night, food shortages, and lack of key nutrients that support biological reactions), and too much (such as , ionizing radiation, temperatures too high for enzyme activity), and life is damaged or destroyed. The journey of life on Earth has primarily been about adapting to varying energy conditions and finding levels where life can survive. For the many hypotheses about those ancient events and what really happened, the answers are always primarily in energy terms, such as how it was obtained, how it was preserved, and how it was used. For life scientists, that is always the framework, and they devote themselves to discovering how the energy game was played.
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The other problem is since plants themselves use oxygen at night once they stop photosynthesizing, NOT CO2, this can be deadly to fish when plant photosynthesis ceases.
This is especially important if your aquarium has a CO2 system that continues to add CO2 at night which can be poisonous to fish as the plants will not use this CO2.
When sugar levels are low, the plant takes nutrients and sugars from older leaves to maintainnew leaves. To help plants in an indoor environment, two options are available: (1) raise lightlevels to increase photosynthesis and sugar production or (2) reduce night temperature to lowerrespiration rates and allow more sugars for growth.
The ground is modified and enriched by the plants growing on it
As with most plants, whenever in doubt never plant too deep
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But you wouldn’t know that from looking at the SAT II Biology
5 Dimension 3: Disciplinary Core Ideas - Physical …
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