Answer and explanation;
-Biomes are specifically defined by their abiotic (non living) and biotic (living) factors. Abiotic factors are those non-living factors that affect a biome, these include, temperature, climate, rainfall, etc. and biotic factors are living factors such as other species of plants and animals living in a biome.
-It is mostly the climate; temperature and precipitation, in an area that determines its biome. This is because climate limits the species of plants that can grow in an area.
-Climate is the major factor affecting the number and diversity of plants in terrestrial biomes.