When does crossing over occur?  Choose from: interphase, prophase, prophase I, prophase II, anaphase II, telophase metaphase, metaphase I, metaphase II, anaphase, anaphase I, , telophase I, telophase II, cytokinesis.  Multiple answers possible.

Puberty in girls is attributed to rising levels of

Which of these cells immunologically protect the developing gametes (sex cells)?

Identify letter E.   

What bone marking is letter E?   

What is a possible cause of muscle fatigue?

What is adjacent superiorly to the conus medullaris of the spinal cord?

What bone marking is letter D?   

Which vertebra does letter C represent?   

Identify the bone marking labeled C in the anterior skull view.