The problem of behaviour at the cellular level (cytoethology).
D000818:Animals; D001001:Anura; D005075:Biological Evolution; D002119:Calcium Carbonate; D002415:Cats; D002454:Cell Differentiation; D002465:Cell Movement; D002467:Cell Nucleus; D002468:Cell Physiological Phenomena; D002736:Chloroplasts; D002816:Chordata, Nonvertebrate / Q000166:cytology; D002923:Cilia; D003063:Cnidaria / Q000033:anatomy & histology; D003593:Cytoplasm; D004847:Epithelial Cells; D056890:Eukaryota / Q000166:cytology; D005260:Female; D005306:Fertilization; D006056:Golgi Apparatus; D008264:Macrophages; D008297:Male; D008928:Mitochondria; D008938:Mitosis; D010063:Ovum; D011161:Porifera / Q000166:cytology; D012605:Scorpions / Q000166:cytology; D013094:Spermatozoa
D002119:Calcium Carbonate