How must contour lines bend on a topographic map to indicate a stream valley? (subject: earth science)

In which process is oxygen absorbed by an organism asap apex

Asnail, elodea (aquatic plant), or both were added to the tubes and they were stoppered. tubes were placed under a grow light for 24 hours and the results recorded. the test tubes were then covered for 24 hours to produce a dark environment and the results recorded. which statement best explains the change in test tube d from the light setup to the dark setup.

What is the correct term for an area of rotating currents in an ocean? when ocean currents combine, they create an area of rotating currents called an