Which pair of elements, when combined together, do not form covalent compound.

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this