Which blood vessel carries blood from the lungs to the heart, X, Y or Z?

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

The data below simulate what happened to peppered moths in england after the industrial revolution which statement best describes the process that produced one of the emding populations of moths ?light colored moths were selected for on light colored trees

When does an organism become an adult during a life cycle? a)before metamorphosis is complete b)after producing offspring c)after development is complete d)before gametes fuse