Scientists have changed the DNA of a type of cabbage so that it contains a tiny amount of poison from a scorpions tail. The poison in the cabbage kills caterpillars that try to eat it. This is an example of

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems