Zoe made the following table to compare prokaryotic and eukaryotic cells.

Structure Prokaryotic cell Eukaryotic cells
Cell wall is present Yes Sometimes
Flagellum for movement Yes No
X is present Yes Yes

Which of the following would best replace X?
DNA
Mitochondria
Nucleus
Vacuole

Match the following terms and definitions. 1. species that are adapted to live in equilibrium at carrying capacity population density 2. population growth that reaches equilibrium and carrying capacity population 3. death rate mortality 4. birth rate k-selected 5. a group of interacting individuals of the same species within the same geographic area natality 6. the number of organisms living in a particular area logistic growth