[Campbell Biologie Page 742] Campbell Biology 12th Edition
Figure 33.7 The life cycle of the hydrozoan Obelia . The polyp is asexual, and the medusa is sexual, releasing eggs and sperm. These two stages alternate, one p
Figure 33.7 The life cycle of the hydrozoan Obelia . The polyp is asexual, and the medusa is sexual, releasing eggs and sperm. These two stages alternate, one p