Answer:
I think B is baby teeth and A is permanent teeth
a) Baby teeth doesn't fall on schedule and permanent teeth come in behind them this results is two rows of teeths.
Its made up of microtubules, microfilaments and intermediate filaments. They give the cell shape and organize its parts
Ageing is the word that describes all that change as the organism evolve and it also includes growth !
<span>They are reactions that complement each other in the environment.</span>
