|adaptation - the process
that changes the anatomy, physiology, or behavior of a population that
enables them to more effectively live in a given environment.
adenosine triphosphate (ATP) - the "energy molecule" of the cell. Cells use ATP and derivatives of ATP to perform metabolic functions. The energy comes from the high energy bonds between the phosphate molecules.
ecosystem - A group of organisms that are interdependent and the environment they live in and depend on. For example, cows grazing on a pasture reflect an ecosystem. It would include the cows and everything that surrounds them, for example, the grass, water, and of course other animals, like the cow birds, army worms, fire ants, soil microbes, and other living things associated with the pasture.
fossil record - when an animal dies, it's bone structure is often preserved when decaying debris or dirt packs on top of it for thousands to millions of years. This is how researchers know what many of the dinosaurs looked like, which led to discovery of how they lived and interacted with the ecosystem.
Marxism - the social and political theories supported by Marx. These theories support a form of government called socialism in which either the people or the government administrates and owns everything, and in turn, unequally distributes the goods and pay according to work done.
- a toothed sea mammal that is often confused with the bottle-nose
dolphin. Both the porpoise and the bottle-nose dolphin are of the
Class: Mammalia, Order: Cetacea, and Family: Odontoceti. However,
porpoises have a shorter, stubby nose, in contrast to the dolphin's more
elongated snout. The porpoise also has a shorter, thicker body than
radioactive dating - a type of absolute dating that allows scientists to determine the age of certain materials, such as carbon. Minerals decay over time, releasing radioactive rays. Scientists know how long it takes for any isotope to decay. Using this information, we can find how old an object is by determining how much radioactive material still exists in the object.
radioactive oxygen - an unstable oxygen molecule that emits radioactive rays until it reaches stability. Scientists use these radioactive isotopes of molecules to trace their path through the body. This allows scientists to see how the body metabolizes molecules.