Some polyhedrons are neither prisms nor pyramids. a. true b. false

True.

Polyhedrons are closed figures which are bounded by polygons such as cube, prism, pyramids.

Non-polyhedrons are solid figure which have sides but are not polygons such as sphere, cone and cylinder.

Please see the attached figure for polyhedron:

Hence, the given statement is true i.e. other polyhedrons are present other than prisms and pyramids.

sry but any answer choices

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.