Which phenomenon occurs when the sun crosses the plane of earth's equator

Structures in cells that carry out specific functions.

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

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen