Rhizobium bacteria are important in soil fertility because plants:
a. cannot use nitrogen from the air
b. lack chloroplasts in the root
c. cannot decompose nodules
d. need the chlorophyll

Explain the importance of producers, primary consumers, secondary consumers and decomposers in an ecosystem.

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

Agene editing technology called crispr-cas9 uses cellular machinery to change the cell's genetic material. how might this technology be useful in treating diseases like cancer?