¿los recursos naturales se pueden emplear para llevar a cabo cualquier tema de investigación?​

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

Liquid water turns into water vapor at which step in the water cycle? a. precipitation o b. water run off c. evaporation d. condensation

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences