It is the primary theory in biology that states life on earth has changed over time due to inheritable changes in DNA. Different species originated in response to varying environmental conditions.
A scientific theory is based on an observable phenomena, like gravity. A theory is the result of a positive test result, and accumulated positive test results that creates the sound basis for how something occurs. If there is no positive test result, it remains an unsubstantiated idea, or hypothesis.
Evolution is the process of physical change, over an extended period of time, that has been slowly accumulating positive test results, to the point where it can now be declared as fact.
Evolution via natural selection, or simply "the theory of evolution," suggests that any imperfect replication scheme coupled with some selection function (in our case the natural environment) will ultimately result in modifications to species.
Monotremes lay amniotic eggs. Monotremes include just the platypus, the short-beaked echidna and the long-beaked echidna.
There are two mammals that lay amniotic eggs. The two mammals that lay amniotic eggs are echidna and platypus.
the ability to survive and reproduce keep fit and healthy
The sex-linked recessive disorder is muscular dystrophy.
A sex-linked disorder is one in which both matching genes must be abnormal for the disease to occur. The term sex-linked recessive usually refers to X-linked recessive. Males have only one X chromosome, so a single recessive gene on that X chromosome will cause a disease (such as hemophilia).
65 million years ago
Protists, with the exception of algae, are unicellular.
an amino acid
The term is "fitness" and the phrase "survival of the fittest" is also expressed by the term natural selection.
Fitness is defined as the tendency of some members of a population to be better able to survive and reproduce and pass on their characteristics.
Asexual reproduction creates duplicate organisms in which mutation occurs by a different process than sexual specialization.
*Viruses, because they can mutate to have different specific hosts or effects, are sometimes considered "non-living" despite their ability to reproduce and change.
because of the interdependence of living things The extinction of one species or development of a new one often affect many others because of their interdependence in an ecosystem.
Because of chemical reaction in the brain
Complex filtering organs in the back of the body are kidneys.
The kind of growth which involves roots and shoots but not the reproductive structers which occurs in most plants is known as apomixis.
Tunicates and lancelets are two subphyla of animals classified as what
Birds are thought to be direct descendents of reptiles