Erich Freytag
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May 29, 2024 · The phenomenon of life can be approached in several ways: life as it is known and studied on planet Earth; life imaginable in principle; and life, by hypothesis, that might exist elsewhere in the universe (see extraterrestrial life). As far as is known, life exists only on Earth.
6 days ago · Living things need food and water to survive. The Earth has just the right ingredients for life. Students in this grade band make observations to construct an evidence-based account of how an object made of a small set of pieces can be disassembled and made into a new object.
Sep 19, 2022 · The origin of life on Earth stands as one of the great mysteries of science. To find out if we are alone in the galaxy, we will need to better understand what geochemical conditions nurtured the first life forms.
May 29, 2024 · The origin of life is a result of a supernatural event—that is, one irretrievably beyond the descriptive powers of physics, chemistry, and other science. Life, particularly simple forms, spontaneously and readily arises from nonliving matter in short periods of time, today as in the past.
1. Organization. Living things are highly organized, meaning they contain specialized, coordinated parts. All living organisms are made up of one or more cells, which are considered the fundamental units of life. Even unicellular organisms are complex! Inside each cell, atoms make up molecules, which make up cell organelles and structures.
Life exists all over the Earth in air, water, and soil, with many ecosystems forming the biosphere. Some of these are harsh environments occupied only by extremophiles.
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life. Order. Figure 1.
