Looks at the ways that animals and plants live together in a balanced way in distinct ecosystems, as well as the ways that human activity can threaten the balance of those systems.
Looks at the scientific classification of organisms, examining the six kingdoms of living things, what distinguishes them, and how they are subdivided.
Introduces gravity and explains how it works, the effects it has on weight, and how the Earth's gravity keeps the Moon in its orbit and everything on the planet in its place.
Introduces electricity; describes how it is made, transferred from the power plant through power lines into the home, and used; and explains how batteries work.
Unit 1 of Book 3 begins by introducing eighth notes in 4/4 and 2/4 time. Swing eighths are also presented in the first half of the book. Folk, jazz, classical, and contemporary selections provide stu
Continuing the comprehensive library of the greatest science fiction hero of all time, this brand new collection of library editions feature all new restorations that will preserve these legendary adv
(Educational Piano Library). 120 color-coded cards to learn basic musical symbols, all notes from low ledger C to high ledger C, and rhythm patterns in 4/4 and 3/4. Also includes cards that focus on r
