[Solved] Playboy magazine rebounded from its declining circulation by discontinuing photos of nude women,thus giving it more respectability. Spiracles: Openings on the surface of some animals, such as insects, spiders, and some fish, which lead to respiratory systems, allowing air to enter the body. Annelids: A phylum of invertebrate animals characterized by their segmented bodies and include earthworms, leeches, and marine worms. Diving Marine Mammals: Marine animals, such as whales, seals, and dolphins, adapted to diving deep under water to feed, communicate, or avoid predators. Adaptations: The method through which a species adapts to its surroundings; this occurs as natural selection works on variation that can be passed down through generations.