1) Explain how extracellular signals can create a fast, or slow response in cells and provide one example of each. 2) Which pathway(s) need to be altered in order to turn a normal cell into a cancer cell?

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated

Which best describes carbon dioxide’s path out of the body