Name the three major external parasites, and describe how they damage their hosts
What will be an ideal response?
Ticks cause damage by penetrating the skin and sucking blood from the host animal. This leaves a sore that can be an avenue for disease organisms, and it can cause anemia from blood loss. Lice cause animals discomfort by biting or piercing the host animal's skin. This causes the animal to rub and scratch against posts, trees, or other objects to obtain relief. In so doing, however, they lose grazing or eating time, and breeding processes may be interrupted. The larvae of heel flies burrow through the soft tissue of an animal, all the way from the leg to the back, where they eat a hole in the skin for a breathing hole. This damages meat and hides.
You might also like to view...
Texas gained its independence with
A. help from Britain. B. no outside assistance. C. help from Americans. D. the blessing of the Mexican government. E. help from Spain.
A chemical engineer is considering two sizes of pipes for moving distillate from a refinery to the tank farm. A small pipeline will cost less to purchase (including valves and other appurtenances), but will have a high head loss and, therefore, a higher pumping cost. The small pipeline will cost $1.7 million installed and have an operating cost of $12,000 per month. A larger-diameter pipeline will cost $2.1 million installed, but its operating cost will be only $8000 per month. Which pipe size is more economical at an interest rate of 1% per month on the basis of an annual worth analysis? Assume the salvage value is 10% of the first cost for each pipeline at the end of the 10-year project.
What will be an ideal response?
____ help engineers determine how much earth must be moved and how much land must be purchased when a road is to be built.
A. Contour drawings B. Profile-curved line drawings C. Cut-and-fill drawings D. Plan and profile drawings
Freeway exits can be dangerous for commercial vehicles, at what speed should you enter the exit?
a. Below the posted speed limit. b. Whatever speed you feel comfortable with. c. At the posted speed.