The type of respiration where gas is exchanged between the blood and air at the alveoli level.

Human beings have how many sets of teeth?

Swallowing is another term for

Which of the following species belongs in the cartilaginous class of fish?

Fungi were once classified as plants.

Which phylum has been the most successful animal on the planet, with over 1 million species?

Invertebrates are separated from vertebrates by not

Which of the following species belongs in the bony class of fish?

What was the first group of vertebrates that evolved amniotic eggs?

Based on the three methods of defining species, scientists now know the exact number of species on the planet.