A pulsar is a neutron star that gives off pulses of radio waves. The Crab Nebula, which is one of millions of gas and dust clouds in space, was found to house a pulsar in the system as is the central object present. Astronomers observing the nebula noticed that it released pulses of radiation that span the electromagnetic spectrum, pulsing radio, gamma and xrays.
The answer is; C
The study of plant and animal life in an environment is known as ecology. Anthropology is mainly defined as the study of humans, their behaviors and societal norms and values (such as politics, culture, religion, and language), in the past and present.
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A majority of the Atlantic Coastal plain is flat, there are no hills or mountains in this region of North America. It contains a lot of sedimentary rock and is primarily used in farming/agriculture. This area of land has good access to the sea. This area also features large embayments with drowned river valley's and many wetlands and marshes.
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Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%. This may be the reason no life exists on these planets.
The atmosphere of Venus is about 96 per cent carbon dioxide, with surface temperatures around 737 K (464 °C, or 867 °F).
Venus itself rotates only once every 243 Earth days.
Mars, in contrast, has a thin atmosphere composed of about 95 per cent carbon dioxide, with the remainder being mostly diatomic nitrogen.
The answer is B. Convergent boundaries collide with each other, the denser plate subducting and the other buoyant plate rising thus making mountain ranges (ex. Himalayas). Divergent boundaries move away from each other, and when a hotspot is below or near, makes volcanos (ex. Hawaiian Islands).