... Ectotherms rely primarily on physical mechanisms of energy (heat) exchange with the environment. Another way of classifying animals is according to their Structural Strategies for thermoregulation. Animals can be divided into two groups: homeothermic and poikilothermic animals. Homeotherms are endothermic animals that maintain a very consistent body temperature within a very narrow temperature range. Birds and mammals are usually very strict ... an important role in temperature regulation. A corrective response can occur where the hairs 'stand on end', and trap a layer of air between the...

• Word Count: 1286
• Approx Pages: 5
• Grade Level: Undergraduate

... original pest. In the 1960s, wildlife biologists were puzzled when the gannet population on Bonaventure Island, Quebec, began to shrink. The shells of the gannets' eggs were too thin to protect the embryos. Only after the eggs had been analysed did the scientists identify the culprit DDT, which had been bioconcentrated through higher levels of the food web. ... , canola oil and baking soda have pesticidal applications and are considered biopesticides. At the end of 1998, there were approximately 175 registered biopesticide active ingredients and 700 products. Biopesticides fall into thre...

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