Which structure is missing from the diagram, but helps mRNA and tRNA bind together?

A. DNA
B. mitochondrion
C. nucleus
D. ribosome

The use of logic making empirical observations and performing dissections were all part of the scientific studies by

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?