How does lack of friction affect the energy of a roller coaster system?

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content

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