- Characteristics of Lichen?

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How do we know that the Galaxies are not moving in unison just like runners in tracts moving at different speeds but same angular velocity? Please Help!!
What is the mass (in grams) of 9.42 × 1024 molecules of methanol (CH3OH)? Find all θ between 0 and 2π that satisfy the following: tan θ = -2.662 and cos θ > 0.? What mass of CH4 is contained in a 461 mL sample of CH4 at −59◦C and 330 torr? Answer in units of g.? Calculate the de Broglie wavelength of a 143-g baseball traveling at 89 mph.?