Question

Помогите Биология 7 класс моллюски класс двухстворчатые 1) тип симметрии? 2)наличие мантии? ответ только ( + или -) 3)наличие раковины и её форма? 4)органы чувств? 5)тип кровеносной системы? 4)наличие сердце и состав? 5)органы дыхания? 6)органы пищеворения? 7)нервная система? 8)размножения?

Answer 1

1) симметрия двустороняя
2)+
3)раковина чашевидной формы 
4)осязание химическое чувство раздражительность 
5)кровеносная система незамкнутого типа
6)сердце присутствует 2 предсердия и 1 желудочек 
7)жабры                                                                печень к желудку железы
8)ротовое отверстие глотка пищевод желудок мантийная полость
9)нервная система узлового типа
10)Раздельнополые

Answer 2

Molusks: Class Bivalves

1) Type of symmetry: Bivalves, which are a class of mollusks, exhibit bilateral symmetry [[1]].

2) Presence of mantle: Bivalves have a mantle, which is a thin layer of tissue that surrounds the internal organs and secretes the shell [[2]].

3) Presence of shell and its form: Bivalves have a two-part hinged shell that is made of calcium carbonate. The shape and form of the shell can vary among different species of bivalves [[3]].

4) Sense organs: Bivalves have sensory organs, including eyes and tentacles, which help them detect light, movement, and chemicals in their environment [[4]].

5) Type of circulatory system: Bivalves have an open circulatory system, which means that their blood is not always contained within blood vessels. Instead, it flows freely through the body cavity [[5]].

6) Presence of heart and its composition: Bivalves have a simple heart that pumps blood throughout their bodies. The heart is composed of one or two chambers, depending on the species [[6]].

7) Respiratory organs: Bivalves have gills, which are specialized structures that extract oxygen from water and remove waste gases [[7]].

8) Digestive organs: Bivalves have a complete digestive system, including a mouth, esophagus, stomach, and intestine. They also have a pair of labial palps that help with food manipulation and digestion [[8]].

9) Nervous system: Bivalves have a relatively simple nervous system. They have ganglia (clusters of nerve cells) that control basic sensory and motor functions [[9]].

10) Reproduction: Bivalves have separate sexes, meaning that individuals are either male or female. They reproduce by releasing eggs and sperm into the water, where fertilization takes place externally. Some bivalves also have the ability to reproduce asexually through a process called budding [[10]].

I hope this information helps! Let me know if you have any further questions.