Chickadees were given an opportunity to store seeds in 72 possible storage sites consisting of holes drilled in small trees that had been placed in an aviary. Typically, the seeds were placed in only 4 or 5 storage sites. The chickadees were then removed from the aviary, the seeds removed from the storage sites, and each hole covered. A day later, the chickadees were returned to the aviary and they spent nearly 5 times as long pulling at the covers on storage sites than at the covers on sites where they had not stored food. This experiment indicates that chickadees

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#Question id: 13016

#Unit 10. Ecological Principles

Which of the following is not true about estuaries?

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#Question id: 11096

#Unit 7. System Physiology – Animal

In which structure does diffusion of oxygen to capillaries not play a major role?

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#Question id: 11048

#Unit 6. System Physiology – Plant

In vascular plants, phloem is the living tissue that transports the soluble organic compound made during photosynthesis in the form of sugar, The phloem tissue is made up of cells called phloem elements. Which of the following given phloem elements are directly involved in translocation?

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#Question id: 17262

#Unit 7. System Physiology – Animal

The body attempts to regain internal balance by adapting to the stressor

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#Question id: 5741

#Unit 8. Inheritance Biology

In a mammal 2 Barr bodies are observed.  How many X chromosomes does the organism have?