A human as the intermediate host Slideshow Play

Adaptation of birds for flight Slideshow Play

Adaptations of birds for flight Student activity Play

Adaptations of mammals to life in water Slideshow Play

Adaptations of mammals to life in water Student activity Play

Adaptations of reptiles and amphibians to life on land Slideshow Play

Adaptations of reptiles and amphibians to life on land Student activity Play

Adaptations of reptiles to terrestrial life Slideshow Play

Aerobic respiration Slideshow Play

Air sac (alveolus) Illustration Play

Airways Animation Play

Alveoli Student activity Play

Amphibians Student activity Play

Animals: vertebrates Student activity Play

Antagonistic actions of the autonomic nervous system Student activity Play

Birds Student activity Play

Blood flow in the human circulatory system Whiteboard exercise Play

Blood flow in the human circulatory system Student activity Play

Body movement Student activity Play

Body protection Student activity Play

Book lungs in arachnids Illustration Play

Cancer-causing agents (carcinogens) Student activity Play

Carcinogens Slideshow Play

Characteristic features of arthropods Whiteboard exercise Play

Characteristics of amphibians Whiteboard exercise Play