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This policy does not prevent an instructor from teaching a hunter education class while employed by a school district , parks and recreation department or other agency or business as long as the salary paid is not dependant on the number of students enrolled in the class . Also , in the third year of the study a major oil spill occurred in the study area after the Braer oil tanker sank on nearby rocks . Results are displayed as high-resolution spectrograms , in color or in true gray-scale . Parental Release forms are required of all students under the age of 18 enrolled in a Hunter Education course . If problems continue , in extreme cases , the student should be told they have failed and must leave the class immediately . Range : This species is distributed in the Sacramento / San Joaquin Estuary in California north to south-central Alaska . In particular , these careers pertain to the impact of knowledge and information technology on the professions , including those in Media and Communications , Software Development , and Education ( among many others ) , in which a broad background in computer science must be combined with a deep understanding of the human mind . Two additional requirements provide occasions for interdisciplinary explorations , in which approach and sector are blended in even proportions . A good proportion of students enrolled in animal behavior courses become motivated for research careers , but there is little hope to offer them that they will actually be able to become practicing scientists when they finish due to severe limitations on research funding . Learning to do this provides the major with an intellectual versatility that can serve well in a variety of future activities ranging from research and / or teaching in physics or astronomy and related sciences to careers in law , health , commerce , etc. This book explores the wide variety of maternal effects that have evolved in plants and animals as mechanisms of adaptation to temporally and spatially heterogeneous environments . In terms of sheer number of species , they are the most successful of all families of vertebrate animals , and the extent and speed with which they have evolved in some African lakes has made them the darlings of evolutionary biologists .