Scientific inquiry is not easy to implement because of several factors. one of the problems is taking into consideration all (data, variables, observations) and deciding which ones to standardize. another problem investigators face during experimentation lies in , observing, interpreting) the evidence.

The answer is observations and interpreting.

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the