Question

Описание речного рака по критериям: Отделы тела Симметрия тела Зрение Усики и их функции Строение ротового аппарата Покров тела Кол-во ходильных конечностей

Answer 1

Покров тела - хитиновый покров.Усики это органы чувств место носа .
Ходильных конечностей 6

Answer 2

Description of the River Crab

Departments of the Body: The river crab's body is divided into two main sections: the cephalothorax and the abdomen. The cephalothorax contains the crab's vital organs, while the abdomen is primarily responsible for locomotion and protection.

Body Symmetry: River crabs exhibit bilateral symmetry, meaning the left and right sides of their bodies are mirror images of each other.

Vision: River crabs have well-developed compound eyes, which provide them with a wide field of vision. These eyes are situated on stalks, allowing the crab to see in multiple directions.

Antennae and Their Functions: The river crab has two pairs of antennae. The first pair, known as antennules, is responsible for sensory functions such as touch and taste. The second pair, called antennae, is primarily used for detecting movement and vibration in the surrounding environment.

Structure of the Mouthparts: The mouthparts of the river crab are adapted for feeding and manipulation of food. They consist of various appendages, including mandibles and maxillipeds, which aid in the handling and consumption of food.

Body Covering: The body of the river crab is covered by a hard exoskeleton, providing protection and support. This exoskeleton is periodically shed through a process called molting, allowing the crab to grow and regenerate lost body parts.

Number of Walking Legs: River crabs typically have eight walking legs, which are used for movement and stability. These legs are jointed and equipped with specialized structures for gripping and walking on various surfaces.

In summary, the river crab possesses a well-defined body structure with distinct departments, bilateral symmetry, well-developed vision, specialized antennae for sensory perception, a complex mouthpart structure for feeding, a protective exoskeleton, and a characteristic set of walking legs for locomotion and stability