A swim bladder allows a fish to

a$.$ regulate its water content in seawater

b$.$ regulate its salt content in seawater

c$.$ regulate its salt content in freshwater.

d$.$ control its buoyancy in water.

e$.$ tolerate changes in water pressure

Animals in which the blastopore becomes the mouth are called

a$.$ stomates.

b$.$ deuterostomes.

c$.$ protostomes.

d$.$ echinostomes.

e$.$ prestomes.

Select the sequence that represents the correct flow of air into the lung of a mammal.

a$.$ larynx $$ trachea $$ bronchi $$ bronchioles $$ alveoli

b$.$ trachea $$ bronchioles $$ bronchi $$ alveoli

c$.$ trachea $$ tracheoles $$ bronchi $$ alveoli

d$.$ alveoli $$ tracheoles $$ bronchi $$ trachea

e$.$ trachea $$ bronchioles $$ Laryn $x$ bronchi $$ alveoli

Select the correct sequence of blood flow in birds and mammals.

a$.$ left ventricle $$ aorta $$ lungs $$ systemic circulation

b$.$ vena cava $$ right atrium $$ right ventricle $$ pulmonary vein

c$.$ vena cava $$ right atrium $$ right ventricle $$ pulmonary artery

d$.$ pulmonary vein $$ left atrium $$ left ventricle $$ pulmonary circuit

e$.$ right ventricle $$ aorta $$ lungs $$ systemic circulation

The distinction between sponges and other animal phyla is based mainly on th absence versus the presence of

a$.$ a body cavity.

b$.$ a complete digestive tract.

c$.$ mesoderm.

d$.$ tissues.

Each of the following is a general characteristic of bryophytes except

a$.$ a cellulose cell wall.

b$.$ vascular tissue.

c$.$ chlorophylls a and $b.$

d$.$ being photosynthetic autotrophs.

e$.$ being eukaryotic.

Which of the following characteristic separates chordates from all othe

a$.$ true coelom

b$.$ post$-$anal tail