Question

Выберите НЕВЕРНЫЕ утверждения. Большинство моллюсков имеет раковины. Все моллюски имеют тёрку. Кровеносная система моллюсков незамкнутая. Все моллюски могут образовывать жемчужины. Все моллюски ведут донный образ жизни.​

Answer 1

Неверные: Все моллюски имеют терку, Все моллюски могут образовывать жемчужины, Все моллюски имеют донный образ жизни.

Answer 2

Ответ:

Неверные - Все моллюски могут образовывать жемчужины, все моллюски ведут донный образ жизни, все моллюски имеют тёрку.

Answer 3

Incorrect Statements about Mollusks

1. Majority of mollusks have shells. - This statement is true. Most mollusks have shells, which serve as a protective covering for their soft bodies. However, there are some mollusks, like nudibranchs, that lack shells [[1]].

2. All mollusks have gills. - This statement is false. While many mollusks do have gills for respiration, there are also mollusks that have lungs or other specialized respiratory structures. For example, some land snails have lungs, and some freshwater clams have specialized gill structures called "pseudolamellibranch gills" [[2]].

3. The circulatory system of mollusks is open. - This statement is false. Mollusks have a closed circulatory system, meaning that their blood is contained within vessels and does not directly come into contact with their tissues. The blood is pumped by a heart and circulated throughout the body [[3]].

4. All mollusks can produce pearls. - This statement is false. Not all mollusks can produce pearls. Pearls are formed when an irritant, such as a grain of sand, gets trapped inside the mollusk's shell and the mollusk secretes layers of nacre (mother-of-pearl) to coat the irritant. This process is most commonly observed in certain species of oysters and mussels [[4]].

5. All mollusks lead a benthic lifestyle. - This statement is false. While many mollusks are benthic, meaning they live on or near the seafloor, there are also mollusks that are pelagic (living in the open ocean), parasitic, or even terrestrial. For example, octopuses are highly mobile and can swim in the water column, and land snails live on land [[5]].

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