A bar magnet is cut in half, as shown. (the first pic)

Which shows the pieces after the magnet is cut?

A. N S N S

B. N S S N

C. N S

D. S N

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

Choose the molecule that is described by each phrase. energy used during long activities:

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials