Can be anything an organism this is to protect itself from severe weather or other dangerous conditions

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?

Helium decays to form lithium. which equation correctly describes this decay?

What is the wavelength of a 3*10^12 hz infrared wave a 3*10^20m b 1* 10^4m c 3*10^-3m d 1*10^-4 m