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(i) Which of the following fossils is in...

(i) Which of the following fossils is invertebrate and which one is vertebrate?
(a) Dinosaur, (b) Ammonite.
(ii) How can the age of fossil be ascertained? State in brief any two methods.

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(i) (a) vertebrate, (b) invertebrate.
(ii) If we dig into a rock / earth then it is reasonable to suppose that the fossil found in the upper layers must be of more recent origin than the fossil found in the deeper layers.
The second way is by detecting the ratios of different isotopes of the same element in the fossil material.
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