Blog

A friend of yours visited a natural history museum that had a replica of the Archaeopteryx. She told you the characteristics of Archaeopteryx that she either noticed or read at the display. Which one did she misread?

The regulatory systems of the animal body maintain a relatively stable internal condition through a process called ________.

In their basic body plan, mollusks have a visceral mass covered with a soft epithelium and a muscular ________ that is used in locomotion.

Oxygen and carbon dioxide are exchanged between alveoli and blood by _______________.

The ____________ valve guards the opening between the pulmonary artery and the right ventricle.

Members of the class ________, which include octopuses, squids, and nautiluses, are highly intelligent.

You and your biology lab class take a field trip to a marine aquarium. Your guide is a marine biologist who studies squids. She explains to your class how squids are able to blend into their environment. She points out that squids have pouches of pigments embedded in their epithelium. The pouches are called

The waste in mollusks is removed by

What do echinoderms and chordates have in common?

The characteristic that enables efficient gas exchange in capillaries is: