Are areas around the world that support similar communities of species, and are smaller, local communities within these areas.
a. biomes . . ecosystems
b. elevations . . biomes
c. biomes . . elevations
d. ecosystems . . climates

a. Biomes . . . ecosystems

Explanation:

A biome is the region which includes the communities of living beings such as plants and animals. These are found in the range of the continents. The organisms living in a particular biome shows the characteristics typical to the biome and adaptations specific to the biome. Biomes becomes different on the basis of the physical climatic conditions specific to them.

The ecosystem is the communities of the species found in the biome. There are many ecosystems in the single biome.

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.