Maps are perhaps the most important tools of a geographer. The value of maps sin geography teaching cannot be overestimated. They record definite facts of positions, relief, climate, vegetation, materials and their distribution broadly over the earth, in continents, countries, states.
The whole surface of a frog blastula can be divided into three main regions. In side each region thee can be recognized areas corresponding to the future organs of the animal.
In the Ooplasm of egg of Amphioxus, four regions are quite well marked. Near the vegetal pole there is found very volky cytoplasm. The animal hemisphere of the egg consists of less yolky and transparent cytoplasm.
A globe is a model of the Earth. It is the three-dimensional representation of the earth. This is the most accurate way of showing the continents, oceans and other relief features in a miniature form. It also shows the correct location of different places in relation to one another.