Which trait is unique to birds?

Flight
Wings
Endothermic
Feathers

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

Mitosis creates two identical daughter cells from one parent cell creates four nonidentical daughter cells from one parent cell is the most common type of reproduction for bacteria is the process by which male and female reproductive cells are created

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures