*Question*
If viruses can only be seen with a microscope, then what can viruses be seen with? Answer choices: - eye - A computer - magnifying glass - microscope - the skin - radiation - Chemical energy - glasses
**Answer**
microscope

*Question*
If puberty leads to sexual changes that travel throughout the body in the blood, then puberty leads to sexual changes that travel throughout the body in what? Answer choices: - blood - A drug. - hair - sleep - painful - years - eyes - chest
**Answer**
blood

*Question*
If if fossils of barnacles are found in a place then that place used to be covered by water in the past, then what fossils have to be found in a place to signify the place used to be covered by water? Answer choices: - bullfrogs - Sediment - Sea urchins - dinosaurs - barnacles - humans - patch reefs - natural gas
**Answer**
barnacles

*Question*
If antigens are proteins, then what are antigens? Answer choices: - animals - negative - positive - complex - proteins - PDAs - humans - parasites
**Answer**
proteins