Products have different or than the reactants. (there are two correct answers select both.)

select one or more:
a. chemicals
b. atoms
c. properties
d. behaviors

the mass of the reactant has to be the as the mass of the product.
select one
a. same
b. different

Which two factors contributed to creating a global culture? the creation of the united nations improvement in telecommunications health issues such as the ebola virus increased opportunities for global travel

Can yall plz me on this question im having a hard time think about it

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?