An abnormal heart rhythm resulting from impulses coming from a locus of tissue in the area of the atrioventricular node is called

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

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

Plz quick a natural resource that is replaceable through a cycle in nature or sustainable practice is called a? the subject is science