Identify the vertebrate group that is being described by the statement. Write the letter of the correct answer. B-Bird M-Mammal F-Fish A-Amphibian R-Reptile 21. Have moist and slimy skin. 22. Skeleton is either cartilaginous or bony. 23. Body is covered with dry skin and scales. 24. Bones are lightweight and hallow. 25. Nourish thie young with milk from the mammary glands.
