List the different types of characters that can be used to determine species or phylogenies?

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u. s. and mexico. the st. lawrence seaway provides an important trading route for the u. s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

What are two reasons for why a species might disappear from the fossil record?