You dissect a specimen of a vertebrate during an anatomy laboratory. It has the following characteristics: lungs, abundant blood capillaries under thin skin, a partially-divided heart, a pulmonary circuit, and four walking legs. What is this animal?

Option b. amphibian

Explanation:

Complete question

You dissect a specimen of a vertebrate during an anatomy laboratory. It has the following characteristics: lungs, abundant blood capillaries in the skin, a three-chambered heart, a pulmonary circuit, and it has four walking legs. You conclude that the animal belongs to which vertebrate group?

a. lung fish

b. amphibian

c. reptile

d. placental mammal

e. marsupial mammal

Solution

An amphibian has following characteristics -

a) A lung through which it breathes on land

b) Well supported network of blood vessels (arteries & viens) beneath their skin

c) Heart with a tripartite structure and a single ventricle. It also has a further division of ventricle into compartments formed by muscular columns

d) Four legs - two folded rear legs and two short front legs

Hence, option B is correct