About 140,000 japanese died in this japanese city when americans dropped an atomic bomb at the end of world war ii.

Explain the importance of producers, primary consumers, secondary consumers and decomposers in an ecosystem.

Compare asexual reproduction to sexual reproduction

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries