Which statements describe theories? Check all that apply. A theory results from several repeated experiments.
O Atheory is based on a single hypothesis.
A theory explains observations and hypotheses.
A theory may be revised over time.
A theory cannot help predict what may happen in the future
A theory is a proven fact.

your answer is "the 1950's"

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.