Which of these was the dominant plant group at the time that dinosaurs were the dominant animals? a. bryophytes b. charophyceans c. angiosperms

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs