Which are the most complex chordates

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees

Which characteristics are typical of a human population in the postindustrial stage?