Question

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Answer 1

Ответ:

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Объяснение:

Answer 2

Comparison of Bivalves and Gastropods

To compare bivalves and gastropods, we will look at their structure, habitat, feeding habits, and mode of existence. Here is a table summarizing the key differences between the two:

| Aspect | Bivalves | Gastropods | |---------------|------------------------------------------|-------------------------------------------| | Structure | Have two shells | Have a single shell | | Habitat | Mostly found in marine and freshwater | Found in marine, freshwater, and terrestrial habitats | | Feeding | Filter feeders | Herbivores, carnivores, or omnivores | | Mode of Existence | Sedentary lifestyle | Mobile lifestyle |

Structure: Bivalves, as the name suggests, have two shells that are hinged together. These shells are made of calcium carbonate and protect the soft body inside. Examples of bivalves include clams, mussels, and oysters.

Gastropods, on the other hand, have a single shell that is coiled or spiraled. Some gastropods, such as slugs and nudibranchs, have lost their shells completely. Examples of gastropods include snails and sea slugs.

Habitat: Bivalves are found in both marine and freshwater environments. They can be found in oceans, rivers, lakes, and even in estuaries. Some bivalves, like mussels, attach themselves to rocks or other surfaces, while others, like clams, burrow into the sediment.

Gastropods have a wider range of habitats. They can be found in marine environments, freshwater habitats such as rivers and lakes, and even on land. Some gastropods, like snails, live in shells and are found in various terrestrial habitats.

Feeding: Bivalves are primarily filter feeders. They use their gills to filter tiny particles, such as plankton, from the water. The filtered particles are then transported to the mouth for ingestion.

Gastropods have a more diverse diet. Some gastropods are herbivores, feeding on algae and plant material. Others are carnivores, preying on small invertebrates. Some gastropods are even omnivores, consuming both plant and animal matter.

Mode of Existence: Bivalves generally have a sedentary lifestyle. They attach themselves to a substrate or burrow into the sediment and remain in one place for most of their lives. They use their shells to protect themselves from predators and environmental conditions.

Gastropods, on the other hand, have a more mobile lifestyle. They can move using a muscular foot and can crawl on surfaces or swim in water. Some gastropods, like snails, carry their shells with them for protection.

Please note that the information provided above is based on general characteristics of bivalves and gastropods. There may be exceptions and variations within each group.

I hope this comparison helps you understand the differences between bivalves and gastropods! Let me know if you have any further questions.