answer: Some living things leave traces behind when they die, and these
traces, which we call fossils, remain for millions of years without
changing. However, for this to happen, that living thing must suddenly be
entrapped in an oxygen-free environment. For instance, if a bird on the
ground had been abruptly covered by a heap of sand millions of years
ago, the remains of that bird could have survived to our day. Similarly,
there are substances secreted from trees called resins. Sometimes, this
honey-like substance covers an insect and turns into the hard material
called amber, which preserves the dead insect for millions of years. This
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There is no difference between ants, frogs or fish living in our day and their
fossilised relatives shown in the pictures.
A
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