Question

1. some mammals are covered with thick fur. 15. mammals use their lungs to breathe. 16. why are vertebrates classified into different groups? give examples of structures for each group.

Explanation:

Vertebrates are classified based on characteristics like anatomical - structural features (e.g., bones, teeth), physiological functions (e.g., respiration, circulation), reproductive methods (e.g., oviparous, viviparous), and evolutionary relationships. For example, fish have gills for breathing and scales on their bodies; amphibians can live both in water and on land and often have moist skin; reptiles have dry, scaly skin and lay eggs on land; birds have feathers and wings; mammals have hair or fur and nurse their young with milk.

Answer:

Vertebrates are classified into different groups based on anatomical - structural, physiological, reproductive, and evolutionary characteristics. Examples: fish have gills and scales; amphibians have moist skin; reptiles have dry scaly skin; birds have feathers and wings; mammals have hair/fur and mammary glands.