Ponds and rivers are two types of:

A. Marine biomes
B. Rain forest biomes
C. Freshwater biome
D. Estuary biomes

C. Freshwater biome

Ponds and rivers are two types of C. Freshwater biome.

To arrive at this answer, you could break down the question and consider the characteristics of each term.

Firstly, let's look at the options given. We have A. Marine biomes, which are generally characterized by saltwater environments and are found in oceans and seas. B. Rainforest biomes, on the other hand, refer to the types of habitats found in tropical areas with dense vegetation and high rainfall. D. Estuary biomes are transitional areas between rivers and oceans, where freshwater mixes with saltwater.

So, this leaves us with C. Freshwater biome as the most appropriate answer for ponds and rivers. Both ponds and rivers are bodies of water that contain fresh or non-salt water and are classified as part of the freshwater biome.

In summary, by considering the characteristics and definitions of each term, we can conclude that ponds and rivers are types of freshwater biomes.

C. Freshwater biome