The single most important limiting factor in any terrestrial biome is

The right answer is available water.

The biome is an ecological unit of very large extent, covering a fraction of one or more continents and characterized by a set of plant and animal species that are specific to it.

The tropical rain forest, the temperate forest, the boreal forest, the grassland, the savannah, the scrub, the desert and the tundra are biomes. Most often, biomes refer to a terrestrial community, but aquatic communities can also be classified as biomes. Marine biomes include coral reefs and deep seabed. Freshwater biomes include lakes, ponds and streams. Their presence or absence indicates the presence of water (or not) in the vicinity of the terrestrial biome.

yes

explanation:

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!