Answer:
Scientists can study tree rings in ice to learn more about past climates.
Explanation:
i think this is right one.
The endocrine system releases hormones into the bloodstream, most of which are released by the pituitary gland
i believe that to be correct
I don’t know if this is close but I have it a try
-responsiveness growth and reproduction
Answer: <span>C, They add to its hardness.
</span>Calcium is naturally dissolved in water, it can be
found in water as Ca2+ ions and causes <span><span><span>water hardness.</span> C</span>omes from rocks
such as limestone, marble, calcite, dolomite, gypsum, fluorite and
apatite. It can also be a ph stabilizer.
</span>
