Why did animals develop characteristics such as thick hides, long horns, or the ability to run fast?
What will be an ideal response?
Animals developed traits that would help them survive in their environment. Animals having traits that aided them in survival stood a better chance of living and reproducing than did animals without the traits. Some of these traits were needed for defense and the toughness to survive under harsh conditions.
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Some architects and engineers prefer to specify low-lift grouting in masonry walls because ________.
A) it is more economical. B) it does not require the use of coarse aggregate. C) it does not require Portland cement. D) it saves construction time and effort. E) none of the above.
The AC component that causes the pulsating voltage is called the ____.
A. vibration B. oscillator C. wave D. ripple
For the cash flows shown, find the value of x that makes the equivalent annual worth in years 1 through 7 equal to $300 per year. Use an interest rate of 10% per year.
What will be an ideal response?
What is the name of a two-axis graph, with a horizontal axis representing time, that displays pulse waveforms?
A) a frequency graph B) a timing diagram C) a digital graph D) an analog graph