Stingrays have their eyes, external nares, gill slits and spiracles on their dorsal surface.  They are dorsoventrally flattened versions of sharks.

Lungfishes are found in freshwater ecosystems (e.g., rivers) in all continents around the world.

Which of the following shares a common ancestor with plants and it’s most like the earliest plants?

The spiral valve of sharks is a special arrangement inside their stomach, which increases the surface area for nutrient absorption.

Dolphins receive sounds through their fat-filled lower jaw.

Cyanobacteria (also called “blue green algae”) posses chloroplasts that perform photosynthesis.

What are the main differences between prokaryotes and protists?

The nurse caring for a client admitted for treatment of diabetic ketoacidosis (DKA) assesses Kussmaul’s respirations, which are

Some shark species perform intrauterine cannibalism (when an embryo eats its brothers and sisters inside the mother’s uterus).

Which of the following is true about craniates?