Question

12. Двустворчатые моллюски 1) имеют присоски 2) являются прекрасными фильтраторами воды 3) являются вредителями садов и огородов 4) являются калорийной пищей для животных и человека 5) производят перламутри натуральный жемчуг 6) имеют чернильный мешок​

Answer 1

Объяснение:

2) являются прекрасными фильтраторами воды особенно беззубка

4) являются калорийной пищей для животных и человек например как устрица,мидия и другие.

5) производят перламутр натуральный жемчуг

Answer 2

Two-shelled mollusks

Two-shelled mollusks, also known as bivalves, are a diverse group of aquatic animals that include clams, mussels, oysters, and scallops. They are characterized by having two hinged shells that enclose their soft body. Let's go through the statements one by one and provide more information based on search results.

1) Two-shelled mollusks have suction cups. There is no information available to support this statement. Two-shelled mollusks do not have suction cups.

2) Two-shelled mollusks are excellent water filters. This statement is true. Two-shelled mollusks are known for their ability to filter water. They have specialized structures called gills that allow them to extract food particles, such as plankton and detritus, from the water. As water passes through their gills, they filter out small particles and consume them as a source of nutrition. This filtering process helps improve water quality by removing excess nutrients and organic matter.

3) Two-shelled mollusks are pests in gardens and orchards. This statement is partially true. While some species of two-shelled mollusks, such as slugs, can be considered pests in gardens and orchards, not all bivalves fall into this category. Slugs, which are gastropods and not bivalves, can cause damage to plants by feeding on leaves, stems, and fruits. However, other bivalves like clams, mussels, and oysters are not typically considered pests in gardens and orchards.

4) Two-shelled mollusks are a calorie-rich food source for animals and humans. This statement is true. Many species of two-shelled mollusks are consumed as food by both animals and humans. Mussels, clams, oysters, and scallops are commonly harvested for their meat, which is rich in protein, vitamins, and minerals. They are often prepared in various culinary dishes and are considered a delicacy in many cuisines.

5) Two-shelled mollusks produce natural pearls. This statement is true. Some species of two-shelled mollusks, particularly certain types of oysters, are known for producing natural pearls. Pearls are formed when an irritant, such as a grain of sand or a parasite, enters the mollusk's shell. In response, the mollusk secretes layers of nacre, a substance that forms the iridescent coating of pearls, around the irritant, eventually creating a pearl.

6) Two-shelled mollusks have ink sacs. This statement is partially true. While some cephalopods, such as squids and octopuses, have ink sacs that they use for defense mechanisms, two-shelled mollusks like clams, mussels, oysters, and scallops do not possess ink sacs.

In summary, two-shelled mollusks, or bivalves, do not have suction cups or ink sacs. They are excellent water filters, can be pests in gardens and orchards (specifically slugs), are a calorie-rich food source for animals and humans, and some species produce natural pearls.