What is an animal's first line of defense in fighting infectious diseases?
What will be an ideal response?
The first line of defense is physical barriers that keep disease-causing agents out. For example, the nostrils are lined with hairs that attract germ-harboring particles before they can enter the body.
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Explain the importance of the air barrier of a house, how air sealing contributes to air tightness of a house, and the proper role of electric boxes that interact with the air barrier.
What will be an ideal response?
Two systems are being considered for the same task. System 1 costs $63 000 new and is estimated to last four years. It will then have a salvage or trade-in value of $4 500. The cost to replace System 1 will be 3.5 percent more each year than it was the year before. It will cost $4 200 per year to operate and maintain System 1, payable at the end of each year. System 2 costs $120 000 to buy and will last eight years. It will have a salvage or trade-in value of $6 000. The cost to operate and maintain System 2 will be $2 400 per year, payable at the end of each year. Assume the task will be performed for eight years. Compare the two systems, state your basis of comparison, and include a cash-flow diagram. All interest rates are 4.0 percent per year unless otherwise stated.
What will be an ideal response?
What is the purpose of counterweights on the crankshaft?
What will be an ideal response?
Every central split cooling system manufactured in the USA today must have a Seasonal Energy Efficiency Ratio (SEER) of at least 10.
Answer the following statement true (T) or false (F)