In the cell cycle, external regulators direct cells to
• A. speed up or slow down the cycle
•B. Remain unchanged
•C. Proceed and then stop the cycle
• D. Grow uncontrollably

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

How are the reproductive cycles of a fungus and a pteridophyte similar? a)both organisms form fruiting bodies that produce diploid seeds. b)both organisms produce haploid spores and exhibit diploid and haploid stages. c)both organisms reproduce sexually when two haploid hyphae fuse. d)both organisms exhibit a diploid stage and are only able to reproduce asexually.