Simple present tense formula- Subject + verb . Third-person refers to a third party individual. It uses the subject pronouns “he,” “she,” “it,” “they.”...
Play media Fig. 20 X-ray video of a female American alligator while breathing. The anatomical structure of the lungs is less complex in reptiles than in mammals, with reptiles lacking the very...
Fig. 15 The arrangement of the air sacs, and lungs in birds Fig. 16 The anatomy of bird's respiratory system, showing the relationships of the trachea, primary and intra-pulmonary bronchi,...