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primary 6 | Maths
| Geometry
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bird S loses its feathers during the hotter months. bird S needs its feathers to protect itself from the cold during the colder months. the lack of feathers during the hotter months does no harm to bird S.
(c)
the young hatchlings do not have thick coat of feathers to protect themselves. they are covered in down only.
the female and male adults replace their feathers at different times to take turns in protecting the hatchlings should the needs arise.
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