Giraffes have changed over time to have long necks so that they can reach leaves on tall trees and drink water from a low pool even though their legs don’t bend. What big idea of biology does this situation

Giraffes have changed over time to have long necks so that they can reach leaves on tall trees and drink water from a low pool even though their legs don’t bend. What big idea of biology does this situation illustrate?

scientific inquiry
biology and society
adaptation and evolution
biological systems

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