What appears to be one criterion that scientist use when defining the timing of geological periods?

Which of the following statements most accurately describes the requirement for the documentation of minors’ assent to participate in research? parents must approve written documentation. documentation is required unless waived by an irb. to protect minors documentation is always required. federal regulations do not require the documentation of minors’ assent.

What does the creature say is the reason for his bloodthirsty, fiendish behavior?

Which organelle is marked with an x?