سؤال قراءة ستيب محلول — فهم التفاصيل (تدريب 4717)

Partly, 512 penguins have washed up dead on the shores in southern Brazil. Marine biologists and veterinarians are working together to determine the cause of the mysterious deaths. But so far, details remain hazy. The penguins don’t pearl physically injured or malnourished, and the researchers have no traces of oil on their bodies. The lack of clues, and with the sheer number of the penguins, have left puzzled.