Notice: Payments for answers will end 4/10/2017. Click for more info.
You have new items in your feed. Click to view.
Question and answer
Q: why is evolution considered a theory?
A: Evolution is any change across successive generations in the heritable characteristics of biological populations. [ Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.[1] Life on Earth originated and then evolved from a universal common ancestor approximately 3.7 billion years
ago. Repeated speciation and the divergence of life can be inferred from shared sets of biochemical and morphological traits, or by shared DNA sequences. These homologous traits and sequences are more similar among species that share a more recent common ancestor, and can be used to reconstruct evolutionary histories, using both existing species and the fossil record. Existing patterns of biodiversity have been shaped both by speciation and by extinction.[2] Charles Darwin was the first to formulate a scientific argument for the theory of evolution by means of natural selection. Evolution by natural selection is a process that is inferred from three facts about populations: 1) more offspring are produced than can possibly survive, 2) traits vary among individuals, leading to differential rates of survival and reproduction, and 3) trait differences are heritable.[3] Thus, when members of a population die they are replaced by the progeny of parents that were better adapted to survive and reproduce in the environment in which natural selection took place. This process creates and preserves traits that are seemingly fitted for the functional roles they perform.[4] Natural selection is the only known cause of adaptation, but not the only known cause of evolution. Other, nonadaptive causes of evolution include mutation and genetic drift.[5] In the early 20th century, genetics was integrated with Darwin's theory of evolution by natural selection through the discipline of population genetics. The importance of natural selection as a cause of evolution was accepted into other branches of biology. ]
Get an answer
Original conversation
User: why is evolution considered a theory?

Weegy: Evolution is any change across successive generations in the heritable characteristics of biological populations. [ Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.[1] Life on Earth originated and then evolved from a universal common ancestor approximately 3.7 billion years ago. Repeated speciation and the divergence of life can be inferred from shared sets of biochemical and morphological traits, or by shared DNA sequences. These homologous traits and sequences are more similar among species that share a more recent common ancestor, and can be used to reconstruct evolutionary histories, using both existing species and the fossil record. Existing patterns of biodiversity have been shaped both by speciation and by extinction.[2] Charles Darwin was the first to formulate a scientific argument for the theory of evolution by means of natural selection. Evolution by natural selection is a process that is inferred from three facts about populations: 1) more offspring are produced than can possibly survive, 2) traits vary among individuals, leading to differential rates of survival and reproduction, and 3) trait differences are heritable.[3] Thus, when members of a population die they are replaced by the progeny of parents that were better adapted to survive and reproduce in the environment in which natural selection took place. This process creates and preserves traits that are seemingly fitted for the functional roles they perform.[4] Natural selection is the only known cause of adaptation, but not the only known cause of evolution. Other, nonadaptive causes of evolution include mutation and genetic drift.[5] In the early 20th century, genetics was integrated with Darwin's theory of evolution by natural selection through the discipline of population genetics. The importance of natural selection as a cause of evolution was accepted into other branches of biology. ]
Prinaker|Points 140|

User: how is radioactive dating important for providing evidence for evolution?

User: what is an index fossil?

Weegy: Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
shifa saleheen|Points 9809|

User: How is DNA used as evidence for evolution?

User: why are vestigial structures not removed by natural selection?

User: What is the term for a preserved footprint left behind by an animal?

Weegy: Preserved footprint left behind by an animal is called trace fossil.
ghelee|Points 194|

User: Which would be a homologous structure to a human arm bone?

User: what is a vestigial structure?

Weegy: Vestigial Structures A structure or organ is vestigial if it has diminished in size or usefulness in the course of evolution. Vestigial structures are markers of evolutionary descent. [ For example, boa constrictors, which are descended from four-legged reptiles, grow tiny hind legs. ]
sipichapie|Points 4460|

Question
Asked 6/11/2012 5:56:32 PM
0 Answers/Comments
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
Questions asked by the same visitor
What is speciation?
Question
Expert Answered
Updated 1/24/2016 11:48:02 PM
1 Answer/Comment

Speciation is the formation of new and distinct species in the course of evolution.

Added 1/24/2016 11:48:02 PM
This answer has been confirmed as correct and helpful.
26,441,633 questions answered
Popular Conversations
What is the solution to the proportion? n/18 = 5/9 A. n = 2.5 B. n ...
Weegy: n/18 = 5/9; 9n = 5 * 18 9n = 90 n = 90/9 n = 10
10/12/2017 10:59:55 AM| 8 Answers
Which of the following has kinetic energy? a. a rock poised for a ...
Weegy: A bow that is drawn back by an archer. B. Has kinetic energy.
10/10/2017 2:00:05 PM| 3 Answers
In which one of the following sentences is a word misspelled? ...
Weegy: The sentence with a spelling mistake is: User: Which of the following is an example of an imperative sentence? ...
10/9/2017 8:45:54 AM| 2 Answers
Which of the following about the double-exposition concerto form is ...
Weegy: The development avoids the tonic is TRUE about the double-exposition concerto form. User: The first section ...
10/9/2017 11:33:19 AM| 2 Answers
The root word "femin-" means:
10/19/2017 10:41:43 AM| 2 Answers
In which sentence is the underlined phrase an adjective ...
Weegy: The sentence with an adjective clause is: User: . In which sentence is the underlined clause an adjective ...
10/10/2017 11:55:36 AM| 2 Answers
What country is John Hus from?
10/11/2017 11:05:31 AM| 2 Answers
Weegy Stuff
S
P
P
L
P
P
P
Points 137 [Total 2029] Ratings 11 Comments 27 Invitations 0 Offline
S
P
L
Points 100 [Total 122] Ratings 0 Comments 100 Invitations 0 Offline
S
Points 76 [Total 76] Ratings 4 Comments 36 Invitations 0 Offline
S
Points 12 [Total 12] Ratings 0 Comments 2 Invitations 1 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
L
Points 1 [Total 100] Ratings 0 Comments 1 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.