scientists find dense rock on earths surface that is made of magnesium and smaller parts of alumminum and silicon. what layer of earth might help this rock help study? explain youre reasoning

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

the answer would be d : p

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

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