A student observing these three embryos under a microscope notes that they look almost identical in their earliest stages.

A student researches the presence of two specific anatomical structures in four different vertebrate species.

Baleen whales are massive marine mammals that filter feed using brush-like baleen plates in their mouths instead of teeth.

Pythons are large snakes that do not have arms or legs.

Scientists are comparing the physical traits of a Mouse (Mammal), a Salamander (Amphibian), a Lizard (Reptile), and a Bird to determine their evolutionary relationships.

A scientist is studying a newly discovered species of blind salamander found in a deep, isolated cave system.