About what percentage of all human existence occurred during prehistoric times?
a. 52.5 percent
b. 67.5 percent
c. 85.5 percent
d. 97.5 percent
d. 97.5 percent
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Weight is a form of _____.
a. force b. energy c. leverage d. distance
Answer the following statement(s) true (T) or false (F)
1. United Laboratories, Inc. classifies toggle switches used for lighting circuits as general-use snap switches and divides these switches into four categories. 2. The AC/DC general-use snap switch is usually marked AC/DC. 3. A three-way switch contains one common terminal and three traveler terminals. 4. The three-way switch has no ON or OFF position.
Helical oil separators are about 58% efficient in separating oil.
Answer the following statement true (T) or false (F)
In grafting, the lower part of the tree is called a _____
a. scion c. primary branch b. rootstock d. parent plant