The answer is B I took the test a while back
A process known as fixation<span>. the majority of nitrogen is fixed by </span>bacteria<span>, most of which are </span>symbiotic<span> with plants</span>
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You can look at magnesium, it can react with oxygen to form oxides. (chemical) it is malleable and a solid at room temperature. (physical)
to measure its density, the mass and volume can be worked out and from this density too. look up the equation, it is quite easy :)
physical changes -- it can be melted, and oxidized <span />
Unit of measurement are globally recognized and necessary for sharing information between scientists around the world.
An accepted quantity that is used to represent a physical quantity is called a measurement unit. A unit of measurement is a specific magnitude of a quantity that has been established and recognized by law or convention and is used as a benchmark for measuring other quantities of the same kind. A multiple of the unit of measurement can be used to express any other quantity of that type. A length is an example of a physical quantity.
A unit of measurement is a specific magnitude of a quantity that has been established and recognized by law or by convention and is used as a reference for measuring other quantities of the same kind.
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According to wikipedia <em>a mid-ocean ridge is an underwater mountains system formed by tectonic plates.
</em>Happy studying!<em>
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