Some scientists look at the boundary between two biological communities and see a sharp dividing line. others looking at the same boundary see a gradual transition with much intermixing of species and many interactions between communities. why are there such different interpretations of the same landscape?

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

If you put a helium-filled balloon in the refrigerator, what will happen?