Mitochondria and chloroplasts are thought to have originated as prokaryotic endosymbionts, true or false?

Iron reacts with oxygen to produce iron oxide (rust). this reaction is represented in an equation as 4fe + xo2 → 2fe2o3. identify the value of x that will balance the equation.

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

Describe the layers of the suns atmosphere?