Fossils are often the hard parts of once-living things. But an organism’s soft parts can also be preserved. Which materials can preserve soft parts? Select all the answers that apply. A. ice B. amber C. sand D. rock

passing a magnet thought the

mixture , because iron gets attracted to magnet .

well in order to answer this question you have to provide more information < 3

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-