Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
Identify these organisms by their phylum
Transcribed Image Text:The image appears to depict a diverse collection of diatoms, which are a group of microalgae with intricate silica cell walls. These walls are often beautifully patterned, which is visible here in the complex shapes and structures.
**Description:**
The diatoms have varied geometric structures, including circular, oval, elliptic, star-shaped, and elongated forms. Their silica cell walls cause light to refract, creating a range of colors and a shimmering effect in the image. These structural differences aid in identification and classification.
- **Circular and Elliptical Forms:** These diatoms showcase radial symmetry with detailed, mesh-like patterns.
- **Elongated Forms:** These have bilateral symmetry and appear with linear and needle-like shapes.
- **Star-Shaped Forms:** These diatoms showcase a higher degree of complexity in their symmetry and pattern.
- **Triangular Forms:** Present with three distinct points, contributing to the variety of shapes present in diatoms.
These structures are not just aesthetically pleasing but are crucial for processes like buoyancy control, protection, and light absorption in water environments.
**Educational Significance:**
Diatoms play a key role in aquatic ecosystems as primary producers in the food web. Their silica structures also contribute significantly to the global carbon cycle. Each structure seen in the image serves as an example of biological innovation evolved over millions of years. Studying these organisms enhances our understanding of ecology, evolution, and environmental conservation.
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