Answer:
The trend line shows the climate having an increase in temperature as the years go by.
Explanation:
The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago.
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The evolution of multicellular life from simpler, unicellular microbes was a pivotal moment in the history of biology on Earth and has drastically reshaped the planet’s ecology. How life originated and how the first cell came into being are matters of speculation, since these events cannot be reproduced in the laboratory. Nonetheless, several types of experiments provide important evidence bearing on some steps of the process.
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It was first suggested in the 1920s that simple organic molecules could form and spontaneously polymerize into macromolecules under the conditions thought to exist in primitive Earth's atmosphere. At the time life arose, the atmosphere of Earth is thought to have contained little or no free oxygen, instead consisting principally of CO2 and N2 in addition to smaller amounts of gases such as H2, H2S, and CO. Such an atmosphere provides reducing conditions in which organic molecules, given a source of energy such as sunlight or electrical discharge, can form spontaneously. The spontaneous formation of organic molecules was first demonstrated experimentally in the 1950s, when Stanley Miller (then a graduate student) showed that the discharge of electric sparks into a mixture of H2, CH4, and NH3, in the presence of water, led to the formation of a variety of organic molecules, including several amino acids. Although Miller's experiments did not precisely reproduce the conditions of primitive Earth, they clearly demonstrated the plausibility of the spontaneous synthesis of organic molecules, providing the basic materials from which the first living organisms arose.
It’s the second one!!
and the first answer!!
The Moho beneath the Tibetan Plateau is significantly deeper than that beneath the neighboring Yangtze Craton and Indochina block.
Sudden Moho fluctuations are also observed over the southeastern plateau boundary, much like those under the eastern plateau margin. Interpret the severe Moho fluctuations over the plateau boundary as having formed during the late Miocene Tibetan Plateau extrusion southeastward. The steep Moho slope was preserved, although subsequent gravity collapse brought crustal extension and mild topographic variation.
The surrounding geosciences are particularly interested in the tectonic uplift of the Tibetan Plateau. A common paradigm for interpreting the geodynamic mechanism on the Tibetan Plateau's edge is mid-lower crustal flow. Due to the varied strengths of ding blocks, the model predicts different surface and Moho topographies across the plateau boundary, i.e., abrupt boundaries on the eastern plateau boundary and mild fluctuations in the southeastern plateau boundary.
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