Which element provides strength to the exoskeletons of clams and oysters?

You see a white marker with an orange circle and black lettering. what does this marker tell you

1. fold your hands together so your thumbs cross over ,and look at your thumbs. which thumb feels most "comfortable" on top is actually controlled by a gene. the left thumb folding over the right thumb is a domi

Climate like that in the sahara desert have the fastest rates of weathering