Yes, ladybirds (or ladybugs) can be found in deserts.
Some live in deserts.
Reindeer are native to and live in the arctic and subarctic regions, so it would be the tundra.
Romania hasn't tundra and deserts.
Plants that live in the deserts and plants that live in the Tundra have commonalities and differences. One commonality is that they have both learned to adapt to very harsh climates. One difference is that Tundra plants are adapted to extreme cold, while desert plants are adapted to extreme heat.
Neither. Reindeer live in the tundra primarily not in deserts.
All of them live in deserts except for reindeer. Reindeer are animals of the tundra.
Tundra and deserts represent different ecosystems.
Russia has tundra but no true deserts.
All deserts are, by definition, relatively dry.
Russia has no true deserts. It does have large areas of tundra in the north which some people confuse with deserts.
Wolves live in a variety of biomes including deserts, taiga, deciduous forests, grasslands, and even in the tundra.