Answer:anser is b have a good one
Explanation:
Im like 98% sure its B because ultra sounds hear the frequency's of the baby in the womb
Answer: Integrins
Explanation: Integrins are proteins and are the principal receptors that attach the cell cytoskeleton to the extracellular matrix (ECM). Integrins by sense whether adhesion has taken place that is to say a cell can regulate the adhesive activity of its integrins from within.