Match each field of study with its definition.
a) geography
b) earth science
c) environmental science
d) oceanography
1) study of earth and its atmosphere
2) study of earth's surface
3) study of human impact on earth
4) study of earth's seas

Geography = study of earths surface

Earth science = study earth and its atmosphere

Environmental science = human impact on earth

Oceanagraphy = earths seas

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

the median of the data is 4.5.