Question

СРОЧНО!!!сравнить раковину брюхоногих и головоногих моллюсков​

Answer 1

Ответ:

брюхоногии имеют раковину не состоящую из стоворок.У головного раковины нет, но есть несколько щюполец.

Answer 2

Comparison of Bivalve and Cephalopod Mollusks

Bivalve and cephalopod mollusks are two distinct groups within the phylum Mollusca. While they share some similarities, they also have several key differences. Let's compare them in terms of their anatomy, behavior, and ecological roles.

Anatomy:

Bivalve Mollusks: - Bivalves have a two-part hinged shell that encloses their soft body. - They have a muscular foot that they use for burrowing, anchoring themselves, or locomotion. - Bivalves have two siphons: an inhalant siphon for drawing in water and food particles, and an exhalant siphon for expelling waste and water. - Examples of bivalve mollusks include clams, mussels, oysters, and scallops.

Cephalopod Mollusks: - Cephalopods have a soft body that is usually enclosed in a mantle, which may or may not be supported by a shell. - They have a well-developed head with complex eyes and a set of arms or tentacles. - Cephalopods use a muscular funnel, called a siphon, for jet propulsion and expelling waste. - Examples of cephalopod mollusks include squids, octopuses, and cuttlefish.

Behavior:

Bivalve Mollusks: - Bivalves are generally sedentary filter feeders, meaning they extract food particles from the water by filtering it through their gills. - They often live buried in sediment or attached to hard surfaces, such as rocks or other shells. - Bivalves can also exhibit limited mobility by extending their foot to move short distances.

Cephalopod Mollusks: - Cephalopods are active predators and have well-developed sensory organs, including eyes and a complex nervous system. - They are known for their intelligence and problem-solving abilities. - Cephalopods use their arms or tentacles to capture prey, and some species can even change color and shape to camouflage themselves.

Ecological Roles:

Bivalve Mollusks: - Bivalves play important ecological roles in aquatic ecosystems. - They help filter and purify water by removing suspended particles and excess nutrients. - Bivalves also provide habitat and food for other organisms, such as fish and birds.

Cephalopod Mollusks: - Cephalopods are higher-level predators in marine ecosystems. - They play a crucial role in controlling the populations of their prey, such as fish and crustaceans. - Cephalopods are also an important food source for many marine animals, including sharks, dolphins, and seabirds.

In summary, bivalve and cephalopod mollusks differ in their anatomy, behavior, and ecological roles. Bivalves have a two-part hinged shell, are filter feeders, and play important roles in filtering water and providing habitat. Cephalopods, on the other hand, have a soft body, are active predators, and play a crucial role in marine food webs.