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drek231 [11]
3 years ago
13

The stage of a virus where it is activated to perform the function for which it was intended is referred to as the _________. se

lect one:
a. propagation phase
b. triggering phase
c. execution phase
d. none of the above
Biology
1 answer:
gavmur [86]3 years ago
3 0

Answer:

The correct option is B. The stage of a virus where it is activated to perform the function for which it was intended is referred to as the triggering phase.

Explanation:

The life cycle of a virus consists of the following stages:

The Dormant phase:

In this phase, the virus doesn't take any action. It just manages to get into the system or software.

The Propagation phase

In this phase, the virus makes copies of itself.

The Triggering Phase

In this phase, the virus performs its function.

The Execution Phase

In this phase, the destruction made by the virus can be seen.  

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Figure 1; Extent of the High Plains Aquifer system
Picture from USGS, 1997 ; Modified by: Tyler Ringler

Click for larger picture

Figure 2; Physiographic Province that gave name to the High Plains Aquifer system
Picture from USGS, 1997 ; Modified by: Tyler Ringler

Click for larger picture

The High Plains Aquifer system

Hydrologic setting

Recharge of the enormous aquifer is attained through precipitation on a large-scale, and more by streams and canals locally. A huge drop in the holding capacities and generalized water levels throughout the region can be seen in the last several decades due to increased irrigation (Figure 3). Some of the runoff through irrigation actually proves to be a moderate source of the aquifer’s own recharges as well (USGS, 1997). The dry arid climate in the west high plains coupled with the higher precipitated eastern region allows for moderate recharge, but over usage is still driving down the overall volumes of water being retained. Between the years of 1950 and 1980, for example, their was a 300% increase in groundwater pumped from the High Plains aquifer system (High Plains, 2000). Average recharge rates for Nebraska and Kansas for the aquifer is around 0.05 and 0.6 inches per year. Most of the recharge occurs in areas where sand dunes or other highly permeable material makes up the land surface (USGS, 1997).

Figure 3; Recharge process of the High Plains Aquifer system.
Picture from Google Image search ; Modified by: Tyler Ringler

Click for larger picture


Hydrologic and Geologic Properties

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Figure 4; Dissolved solid content for Kansas and Nebraska regions of aquifer
Picture from USGS, 1997

Click for larger picture

Figure 5; Dissolved sodium ion content for Kansas and Nebraska regions of aquifer
Picture from USGS, 1997

Click for larger picture

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