... variation in tolerance to environmental extremes, maximal in endothermal birds and mammals. Land and water are two basic environments, and many animals move between them or secondarily into air for relatively brief periods. Locomotion is significant in animals (lacking in plants for most part) to allow these movements, also movement about home range and long-distance movements ... for predator avoidance) or to increase or decrease heat load by absorbing or reflecting sunlight (homeostasis). HUMAN EFFECTS. Those that are negative to the environment include habitat destruction, chemical po...

• Word Count: 12375
• Approx Pages: 50
• Has Bibliography
• Grade Level: Undergraduate

... , and influence regional and global climate. Commercial logging, clearance for agriculture, ranching, and fuel gathering are all responsible for the destruction. Their greatest threat is acid rain pollution, which is already severely affecting large areas of the conifer forests of northeast North America and Europe. Solutions include the development of alternative fuel wood supplies through fuel wood plantations ... relatives tend to loose genetic vigor), but relative to the magnitude of the problem, such efforts are very limited. Water supplies are threatened virtually worldwide with de...

• Word Count: 654
• Approx Pages: 3
• Grade Level: Undergraduate

... sunlight-filtering effect can be observed in those cities when smog appears like a brown or yellow cloud, giving those cities a perpetually overcast sky (Makhijani, 31). Fortunately, carbon monoxide reduction and pollution controls have reduced smog and ozone to a great extent in North America and Europe. But above the inhabited layer of the atmosphere, the ozone layer is depleted by the presence ... other chemical refrigerants may not have the same effectiveness as freon, which is the most popular "active ingredient- in car and home air conditioning systems (Makhijani, 79). However, EP...

• Word Count: 1616
• Approx Pages: 6
• Has Bibliography
• Grade Level: Undergraduate

... such as mosquitoes) and birds Pesticides are meant to kill. They fall into five main chemical categories, all of which have different effects: organochlorines (e.g. DDT) which are persistent in air and water and remain for a long time in body fat; organophosphates (e.g. parathion) which damage the nervous system and were originally developed as nerve gases in the First World War; ... chemicals that insects produce to communicate with each other. Fruit growers often use pheromones to control the reproduction of codling moths. Special devices release female codling moth pheromone into the...

• Word Count: 2580
• Approx Pages: 10
• Grade Level: Undergraduate