The presence of a mid-ventral heart is a character of:

Match the Following: (a) Limbless reptile (b) Jawless vertebrate (c) Limbless amphibian (d) Flightle

Poikilotherms are animals that:

Mammals are viviparous (give birth to young) except:

Which of the following is a characteristic feature of mammals?

Reptiles are characterized by: