Llamas, Andreu

Describes the human skeleton, major muscles of the body, the internal composition of bone, and the process of muscular contraction.

Describes the organs and their actions that are involved in the journey of food through the body and the acts of ovulation, fertilization, and reproduction.

Describes the structures and functions of the respiratory and circulatory systems, including the lungs and airways, blood cells, the heart, arteries, veins, capillaries, pulmonary circulation and the lymphatic system.

Describes the physical characteristics, habitat, behavior, and life cycle of these large marsupials.

Describes the physical characteristics, habitat, behavior, and life cycle of frogs.

Describes the physical characteristics, habitat, behavior, and life cycle of these flat fish, some of which have organs that can produce electricity.

Describes the physical characteristics, habitat, behavior, and life cycle of these tiny, leaping parasites.

Describes the physical characteristics and habits of mussels and other mollusks.

Examines the different types, habitat, physical characteristics, enemies, and ancestors of sponges.