Polar bear adaptations: Have thick layer of fat and white in color What will be the reason for their adaptation?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Explain why ecosystem diversity results in species diversity in a healthy biosphere

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii