14. A cluster of tumor cells that produces and secretes growth factors to induce surrounding cells to grow and divide is showing which type of cell-to-cell signaling? (A) autocrine (B) paracrine (C) endocrine (D) neuroendocrine

18. Penguins, seals, and tuna have body forms that permit rapid swimming, because _______. (A) all share a recent common ancestor (B) all of their bodies have been compressed since birth by intensive underwater pressures (C) the shape is a convergent evolutionary solution, which reduces drag while swimming (D) this is the only shape that will allow them to maintain a constant body temperature in water

14. A cluster of tumor cells that produces and secretes growth factors to induce surrounding cells to grow and divide is showing which type of cell-to-cell signaling?
(A) autocrine
(B) paracrine
(C) endocrine
(D) neuroendocrine

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