As a star's size increases, its luminosity ___ as a star's temperature ___, its luminosity increases 1. is the first blank increases or decreases?
2. Is the second blank increases or decreases?

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: