That statement is true. When a frog hatches from the egg, a fish like creature called a tadpole emerges. As the tadpole grow, lungs and legs grow, and the gills and tail "absorb," into the body. After that, the now frog creatures spends most time on land. Hope that helped! Vote this as the brainliest answer please!
Secondary Succession<span>
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Answer:
Answer is D - cAMP.
Explanation:
cAMP is a small molecule that functions as an intracellular signaling molecule - a second messenger. The first messenger would be the thing that activated the GPCR (e.g. a hormone). The GPCR is a signal transducer (converts extracellular signal to intracellular signal). Once activated, the GPCR activates adenylate cyclase which can be called a signal effector - it is an enzyme that produces cAMP.
