This statement referring to packed rations, animals and insects, and plants as the three basic food sources during isolation stands true.
Ration is the entire amount of food provided to a person to be consumed during a specific activity and over a specific period of time, particularly when it pertains to military personnel engaged in combat. Packed ration is an important food source during isolation when there is a calamity.
All life forms use plants as their primary source of nutrition. Since no animal can produce food or oxygen without plants, they are the primary sources of these resources on earth. Fish and cattle that humans consume for their meat both eat algae, hence both are dependent on plants for their survival.
To learn more about food sources here: https://brainly.com/question/28060069
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