advantages and disadvantages of polythene
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Answers:Advantages Wind tunnels use real air, so you can expect the airflow to behave more or less in the same fashion as it would on the real thing. When calibrated the results should be good enough to make reasonable predictions on the performance of a full sized aircraft. Disadvantage One of the major downsides of wind tunnels is the cost. Large wind tunnels are expensive to build and maintain, they consume an awful lot of power in both propelling the air and in some circumstances cooling it down.
Answers:a) The advantages are that they (hopefully) learn how to behave appropriately around other-gender. They have opportunities to interact (group projects) without the pressure of being "on a date." b) Disadvantage is that less learning is going on. They distract each other and take focus off education. In a single-gender situation, the teaching style can be tailored to the gender. One example of this, depending on the individual students, is that boys tend to like action, girls like workbooks, that kind of thing. More learning is going on in single-gender classes, more focusing, less showing off, less socializing. Best to you.
Answers:Advantage: Pests which spread diseases (think mosquitoes) are eliminated. Crops are preserved. Disadvantage: Pesticides are poisonous and need to be regulated... unregulated pesticides kill humans and animals. Also, pesticides don't distinguish between bad pests (ie - aphids) and helpful pests (ie - ladybugs or bees).
Answers:Asexual Reproduction is the formation of a new organism where there is the presence of a single parent, and no joining of gametes (e.g. sperm, pollen, egg). The offspring has identical genes and chromosomes to the parent. Advantages of Asexual Reproduction - No energy is expended to find a mate. There is a high chance of survival of the offspring, if the offspring remains near the parent in a stable environment. Disadvantages of Asexual Reproduction - Less genetic diversity gives the offspring a lesser chance of survival if the environment changes.