Skachat Besplatno Prezentatsii Po Biologii 7 Klass Briukhonogie Molliuski -

Include a labeled drawing of the Radula and the Internal Organs .

Includes a radula (a "grater" with chitinous teeth) to scrape food. Respiration: Aquatic species: Gills . Terrestrial species: A lung (a modified mantle cavity).

Part of the food chain; decomposers of organic matter. For Humans: Food source: Escargot (snails). Pests: Slugs damage agricultural crops. Medicine: Source of mucus for cosmetics and research. Include a labeled drawing of the Radula and

Evolutionarily lost their shells to move into tight spaces.

Provides protection; can be coiled (right or left-handed) or reduced (as in slugs). 📂 Slide 3: Internal Anatomy Terrestrial species: A lung (a modified mantle cavity)

Most terrestrial snails (e.g., Grape Snails).

Open system with a heart (one ventricle and one or two auricles). Pests: Slugs damage agricultural crops

Consists of a head , a visceral hump (inside the shell), and a muscular foot .