*Question*
Q: Viroids are plant pathogens much simpler than what, but like them can reproduce only within a host cell? Choices: - pests - bacteria - parasites - viruses A:
**Answer**
viruses

*Question*
Q: What is the transparent outer covering of the eye? Choices: - pupil - iris - retina - cornea A:
**Answer**
cornea

*Question*
Q: Where do archea live? Choices: - in mammals - in the ocean - underground - everywhere A:
**Answer**
everywhere

*Question*
Q: What is the transfer of heat by a current? Choices: - radiation - combustion - diffusion - convection A:
**Answer**
convection