natural Flashcards
Adaptation
the act or process of changing to better suit a situation A body part or feature or a behavior that helps a living thing survive and function better in its environment. adaptation.
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity.
Evolution
In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. … Evolution relies on there being genetic variation? in a population which affects the physical characteristics (phenotype) of an organism.
Fossil
Fossils are the remains or traces of ancient life that have been preserved by natural processes, from spectacular skeletons to tiny sea shells. Imprints, tracks and trails can also become fossilised, like dinosaur footprints or worm burrows. These are called trace fossils.
Fossil Record
The fossil record helps paleontologists, archaeologists, and geologists place important events and species in the appropriate geologic era. It is based on the Law of Superposition which states that in undisturbed rock sequences the bottom layers are older than the top layers.
Trait
a distinguishing quality or characteristic, typically one belonging to a person.
Selective Breeding
Selective breeding involves choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics. Humans have selectively bred plants and animals for thousands of years including: … ornamental plants with particular flower shapes and colours.
Natural Selection
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
Generation time
In population biology and demography, generation time is the average time between two consecutive generations in the lineages of a population. In human populations, generation time typically ranges from 22 to 33 years.
Speciation
Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within lineages.
Relative Dating
Relative dating is the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age (i.e. estimated age).
Absolute Dating
Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. … Absolute dating provides a numerical age or range, in contrast with relative dating, which places events in order without any measure of the age between events.
Geologic Time Scale
The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
Extinct
gone forever
Plate Tectonics
Plate tectonics is a scientific theory that explains how major landforms are created as a result of Earth’s subterranean movements. … In plate tectonics, Earth’s outermost layer, or lithosphere—made up of the crust and upper mantle—is broken into large rocky plates.