Mores 



The general behavioural attributes of motile organisms, 

 or groups of animals possessing particular ecological charac- 

 teristics. 



Morphogenesis 



The origin and development of the form and structure 

 of an organism or one of its parts. 



Morphology 



The study of the form, structure, and development of 

 organisms. 



Morphology (Soil) 



The constitution of the soil including texture, structure, 

 and other properties. 



Mosaic 



(1) A pattern of vegetation in which two or more kinds 

 of communities are interspersed in patches, e. g., clumps of 

 shrubs with grassland between. (2) A symptom of some kinds 

 of virus disease. 



Moss 



(1) A plant in the class Musci, phylum Bryophyta. (2) 

 A Bog. 



Muck 



An organic soil consisting of fairly well decomposed un- 

 recognizable organic material that is finely divided, dark in 

 color, and with a relatively large content of mineral matter. 



Mulch 



A natural or artificial layer of plant residue or other 

 material such as sand or paper on the soil surface, cf. Dust 

 mulch. 



Mulch Tillage 



Working of the soil so that plant residues are left on 

 the surface. 



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