A phylum common to unicellular plants and animals isA. MoneraB. PlantaeC. FungiD. Protista

To solve the question, let's analyze the options provided:

A. Monera

This phylum includes prokaryotic organisms, such as bacteria and archaea. Monera does not typically include plants or animals.
B. Plantae

This phylum comprises multicellular plants. While it includes some simple forms like algae, it does not encompass unicellular animals.
C. Fungi

This phylum includes fungi, which are primarily multicellular organisms (like mushrooms) and some unicellular forms (like yeast). However, fungi are not classified as plants or animals.
D. Protista

This phylum consists of a diverse group of mostly unicellular organisms, which include both plant-like organisms (such as algae) and animal-like organisms (such as protozoa).
Given that the question asks for a phylum common to unicellular plants and animals, the correct answer is:

D. Protista

In conclusion, Protista is the phylum that includes both unicellular plant-like and animal-like organisms.