Question

what can you learn from a set of embryo drawing of vertebrates of different phyla

Answer 1

The answer is the relationship between vertebrates of different phyla and their evolution.

Embryo drawing is drawing of embryos in different developmental stages. The more embryo drawings of some groups are similar to each other, the more the groups are related. If groups are related, they will have more similar genes determining the basic body plan. 

Answer 2

The answer to this question stated above is :

 The set of embryo drawings of vertebrates of different phyla tells you their “phylogenetic relationship”.
>Phylogenetic relationship” is a term which refers to the relative times in the past which species shared common ancestors.