A key strategy in sustainable farming is integrated pest management (IPM) which is the combination of different techniques to create an effective pest control system. Not all pests need to be eliminated; monitoring and prevention of pest is also an integral part of IPM. Aquafarming is the farming of aquatic species such as fish, crustaceans, mollusks, and aquatic plants and often uses sustainable farming techniques. The limits of a certain type of aquafarming pest during the farming of catfish might be expressed as a 10 ug/L, not to exceed 2 days, and not to recur more than once every 6 months. What does 6 months represent in the management of pest limits for the above example? a) average
b) duration
c) frequency
d) magnitude

The correct answer is C. Frequency.

Explanation:

In statistics, frequency is called the period of time that elapses between a certain event developing and repeating itself again. That is, the frequency measures the duration of the process of repetition of a certain event.

Thus, for example, if an earthquake occurs exactly every 4 months in a certain place, this natural catastrophe occurs with a frequency of 4 months.

Therefore, if the limits of a certain type of aquafarming pest during the farming of catfish might not to recur more than once every 6 months, this expression refers to the frequency with which said event must (or in this case, not must) happen.

Explanation:

Planaria (earthworms,flatworms ) are sensitive to many stimuli including: chemical gradients, texture, etc. When a Planarian is placed in a novel environment, there is an initial exploratory phase. he planaria can perfectly regenerate all elements of its morphology.