What is another name for a reactant? a)product
b)output
c)metabolic pathway
d)input

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

What does the number 18.9984 represent in the image?

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.