Conductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.onductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.
Butterhead lettuce. A type of head lettuce whose botanical name is Lactuca sativa var. heirloom. Two common types are Boston and bibb lettuce. Have small, round, loosely formed heads with soft, buttery-textured leaves ranging from pale green on the outer leaves to pale yellow-green on the inner leaves.
The best-known are: ladybirds, lacewings, syrphus ribesii, earwigs and ichneumon flies. 1  Strawberry aphid - (Chaetosiphon fragaefolii) - The strawberry aphid is a small whitish green louse, which exclusively occurs on strawberries. 2  Shallot lice - (Myzus ascalonicus) - Shallot lice are small and bluish green.