Why do scientists think earths core contains iron?
a iron is lighter than silicon
b iron is a heavy element and would sink into the planet
c the crust also contains a great deal of iron
d iron does not conduct electricity

The best answer seems to be B. iron is a heavy element and would sink into the planet because iron is a metal so it is heavy and when something is heavy it sinks the lowest it can go, so when the earth was developing, iron and other heavier substance sunk towards the middle of earth

Ican answer some, but not all! 2.) sensory info not being transmitted to the brian will result in a lack of responses that could be life saving. 4.) sensory adaption will helo people recognize certain images or objects that will give them a clearer understanding and expand their knowledge. them also become familiar with their surroundings. 8.) light the retina detect an object as it passes through the pupil and into the retina. 12.) cones in the retina us see color. they us see red. blue and green

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