21. Explain how the wing structures of the kiwi bird and the ostrich are different from the wing structure of the eagle. (Hint: Take a look at the bird skeleton pictures and reflect on the size of the wings in each organism.)
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the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's