The Science Literacy Bundle 4 includes (11) readers with Lexile scores 470L-510L. Reading Level Grade 3.  - Mammals is currently out of stock.
 
In Bacteria and Archaea, young readers learn about the biology of bacteria and archaea, organisms too small to be seen with only the eyes. Students learn that bacteria are shaped like rods, spheres, or spirals and live alone or in colonies, and archaea come in different shapes and can live in very hot or very salty places.
 
In Viruses, young readers learn that although viruses are too small to be seen with only our eyes, they are made of atoms and molecules and are not considered alive by most scientists as they do not have all the parts of a cell. They can cause diseases and must live in other organisms.
 
In DNA, young readers are introduced to DNA, a polymer made of two long strands of atoms and molecules linked together and wrapped around each other in a double helix shape. DNA is found inside cells and creates a genetic code that determines many of the characteristics of a living thing.
 
In Wheels on a Bike, young readers are introduced to the scientific concept of rotational motion. Physics defines any object moving around a center point as using rotational motion. The wheels of a bike moving in a straight line use linear motion and, as they turn, the wheels also use rotational motion.
 
In Solids, Liquids and Gases, young readers are introduced to the states of matter. Water exists as a solid (ice), a liquid, or a gas (water vapor) depending on how much energy the water molecules have. Energy and molecules are explained.
 
In Inertia, young readers are introduced to basic scientific concepts about inertia. In physics, inertia is when an object resists a change in motion. Inertia keeps objects that are in motion moving and objects that are not moving at rest. Force is any action that changes the location, shape, or speed of an object.
 
In Photosynthesis, young learn that plants use sunlight to make food during photosynthesis. Chlorophyll makes plants green and is a molecule that catches the sunlight, sending it to the chloroplast, an organelle in plant cells that makes sugar. Some plants use photosynthesis all year; some don’t. Atoms, molecules, cells, and organelles are reviewed. (Students should be familiar with Chemistry Readers Atoms and Molecules, and Biology Readers The Cell: A Tiny City, and Plant vs. Animal Cells)
 
Sea Stars are in a group of animals called echinoderms. They live in salt water and have spiny skin, 5 or more arms, a flat body with mouth and tube feet on the underside, and an eye on the tip of each arm. They are different sizes and colors.
 
In Marshmallows, Mud Pies, and Messy Rooms, young readers learn the chemistry of mixtures: any two or more things mixed together—large things to molecules. Mixtures can be separated by hand or with tools, including filtration, evaporation, and paper chromatography.
 
In Planets, young readers learn a planet is an object in space that orbits a star, is spherical, and is big enough to have its own gravity. Earth is one of 8 planets that orbit the Sun. There are two different types of planets. Terrestrial planets are Earth-like, and Jovian planets are Jupiter-like.
 
Duck-Billed Platypus: This Australian animal is a monotreme, the group name for the only egg-laying mammals. Platypuses eat while in the water, usually at night. The female lays 1-3 eggs and cares for the young. The male has a spur on each hind leg that releases poison.