C. Hardness is the answer
Just took the test, the answer was 100, not 2
If a star is located 100 light years from earth the light will tack 100 years to reach earth I hope I helped you and good luck
<span>Although both macro algae and mangrove trees are multicellular and share many of the same structural features, macro algae are not true plants. Also, mangrove trees and marsh plants typically live in brackish water rather than salt water and are not completely submerged, as opposed to macro algae.</span>
