Question

all organisms in the kingdom ______ must be viewed using a microscope. a archaebacteria b fungi c plantae d protista

Explanation:

Archaebacteria (a domain, often grouped with Eubacteria as Monera in some classification systems) are all unicellular prokaryotes, too small to be seen without a microscope. Fungi (e.g., mushrooms), Plantae (e.g., trees), and many Protista (e.g., large algae) include macroscopic organisms visible to the naked eye.

Answer:

A. Archaebacteria