691Dolphins and whales are technically classified as which type of animal, despite living entirely in water?
692Unlike fish, whales and dolphins must regularly surface mainly in order to do what?
693A group of interbreeding individuals of the same species living in a particular area is generally referred to in ecology as what?
694All the different populations of various species living and interacting together in a given area are collectively called what in ecology?
695In a typical grassland food chain, grass acts as a producer while a grazing animal such as a deer acts as what?
696A lion that hunts and feeds on a zebra in a food chain is generally classified as what type of consumer?
697An invasive species is generally defined as a non-native organism introduced into a new environment that tends to do what?
698Wetlands are valuable ecosystems mainly known for providing important habitat as well as helping to do what?
699Which large flightless bird, native to Africa, is generally recognized as the fastest runner among all living birds?
700Earthworms play a beneficial ecological role in soil mainly by helping to improve what?
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