Crystal needs more protein in her diet. Which food sources will best provide the building blocks she needs?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering