A scientist studies a dragonfly species. She started with two parent dragonflies and has raised many generations. All have had four wings. In the most recent generation of dragonfly offspring, one dragonfly had eight wings. What do you think caused this change? Identify if the change is helpful, harmful, or mutual and provide an explanation for your choice.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

what is this saying?

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.