If organ systems are present in an animal, what else must be present

Drag each label to the correct location. each label can be moved more than once match the properties with the subatomic particle

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

Which of the follow describes a disadvantage secondary sources have compared to primary sources?