The structure that covers the opening to the trachea during swallowing, thereby preventing food from entering the air passageway, is the

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

The term equestrian relates to which animal? bulls cows horses pigs

Pl which diagram illustrates prophase?