Which defines an atom? a. building block of energy
b. building block of matter
C. charged particle
d. smallest particle

Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than

The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca