What unexpected observation lean darwin to develop the theory of natural selection?

Most scientific questions are based on opinions. hypotheses. observations. experimental data.

Which term describes the number of waves that pass a given point in a given time? crest frequency trough wavelength

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels