The first type of life on Earth was

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a. an ionic bond is formed between the oxygen and carbon atoms. b. four valence electrons are shared. c. two valence electrons are shared. d. valence electrons are shared between oxygen atoms.

Mercury had an average distance to the sun of 0.39 au explane how to calculate the orbital period of mercury and then calculated it