The weaver birds from the african savanna exhibit a trade-off between risking starvation and being hunted by predators. as a result the birds that are of medium weight have the selective advantage and make up the majority of the population. which type of natural selection is at work here?

How do temperature and salinity affect deepwater currents? they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water.