#Question id: 8887
#Unit 9. Diversity of Life Forms
Generally, members of which flatworm class(es) are nonparasitic?
#Question id: 10334
#Unit 6. System Physiology – Plant
N2 combines with hydrogen to form ammonia under elevated temperature (about 200°C) and high pressure (about 200 atmospheres) and in the presence of a metal catalyst (usually iron). The extreme conditions are required to overcome the high activation energy of the reaction. This nitrogen fixation reaction, called
#Question id: 4968
#Unit 11. Evolution and Behavior
Which of these observations fails to support the endosymbiotic theory for the origin of eukaryotic cells?
#Question id: 19887
#Unit 13. Methods in Biology
#Question id: 10581
#Unit 10. Ecological Principles
Life-history characteristics associated with K-selected organisms include