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The Fossil Record of the Cambrian “Explosion”: Resolving the Tree of Life

Geologist Keith Miller examines the "Cambrian Explosion", a period of rapid evolutionary diversification approximately 575 million years ago, and whether it poses a challenge to evolutionary theory. From the June 2014 issue of Perspectives on Science and Christian Faith from the American Scientific Affiliation.

 

What scientific evidence do we have about the first humans?

In recent decades, scientists have discovered more about the beginnings of humanity. The fossil record shows a gradual transition over 5 million years ago from chimpanzee-size creatures to hominids with larger brains who walked on two legs. Later hominids used fire and stone tools and had brains as large as modern humans. Fossils of homo sapiens in east Africa date back nearly 200,000 years. Humans developed hearths for fire, stone points for spears and arrows, and cave paintings by 30,000 years ago. By 10,000 years ago, humans had spread throughout the globe. Genetic studies support the same picture. Humans share more DNA with chimpanzees than with any other animal, suggesting that humans and chimps share a relatively recent common ancestor. Also, the same defective genes appear in both humans and chimps, at the same locations in the genome—an observation difficult to explain except by common ancestry. Genetics also tells us that the human population today descended from more than two people. Evolution happens not to individuals but to populations, and the amount of genetic diversity in the gene pool today suggests that the human population was never smaller than several thousand individuals. Yet all humans, of all races, are descended from this group. Humanity is one family.

 

From Intelligent Design to BioLogos

In this paper, Venema tells the story of his transition from support of Intelligent Design to the view that God uses evolution as a creative mechanism.

 

Design in Nature

In this paper, adapted from an article from Science & Christian Belief, Dr. Oliver R. Barclay compares and contrasts the biblical view of design in nature with modern design arguments.

 

Evolution and the Origin of Biological Information

In this paper, Venema explores several examples in biology where random mutation and natural selection have indeed led to substantial increases in biological information. The question of how new specified information arises in DNA, far from being an “enigma”, is one of great interest to biologists.

 

Why Dembski’s Design Inference Doesn’t Work

Mathematics professor James Bradley looks at the design argument presented in William Dembski's book The Design Inference and offers his criticisms on the accuracy of the model.

 

Seeking a Signature

In this article, Venema offers his review of Stephen Meyer's book Signature in the Cell.

 

Science and the Question of God

Can science provide substantive insight into the question of God’s existence? Isaac's paper examines three schools of thought regarding the possibility of detecting God’s existence through science: Evolutionism, Creationism, and Intelligent Design.

 

Intelligent Design, Thomas Aquinas, and the Ubiquity of Final Causes

In this paper, Baylor philosophy professor Francis Beckwith distinguishes between Intelligent Design (ID) and Thomistic Design (TD).

 

Does the Cambrian Explosion pose a challenge to evolution?

The “Cambrian Explosion” refers to the appearance in the fossil record of most major animal body plans about 543 million years ago. The new fossils appear in an interval of 20 million years or less. On evolutionary time scales, 20 million years is a rapid burst that appears to be inconsistent with the gradual pace of evolutionary change. However, rapid changes like this appear at other times in the fossil record, often following times of major extinction. The Cambrian Explosion does present a number of interesting and important research questions. It does not, however, challenge the fundamental correctness of the central thesis of evolution.

 

How can evolution account for the complexity of life on earth today?

A complex biological structure with many interacting parts might appear, at first glance, as if it were originally created in its present form with all its interlocking components fully formed and intact. It doesn’t seem possible that they developed step by step via biological evolution. In Darwin’s Black Box, Michael Behe introduces a term that he and other proponents of Intelligent Design use for this concept: irreducible complexity.

 

Does thermodynamics disprove evolution?

A common argument against biological evolution is that the theory contradicts the second law of thermodynamics. The second law says that disorder, or entropy, always increases or stays the same over time. How then can evolution produce more complex life forms over time? The answer is that the second law is only valid in closed systems with no external sources of energy. Since the Earth receives continual energy from the Sun, the second law does not apply.

 

Are gaps in scientific knowledge evidence for God?

Every field of science has unanswered questions and gaps in our understanding. Scientists typically view these as open research questions. Others sometimes argue that if science can’t explain how something happened, then God must be the explanation. Such arguments are called “god-of-the-gaps” arguments. The risk in these arguments is that science is always developing. If gaps in scientific knowledge are the basis for belief in God, then as scientists fill in the gaps, the evidence for God disappears. The God of the Bible, however, is much more than a god of the gaps. Christians believe that God is always at work in the natural world, in the gaps as well as in the areas that science can explain.

 

What does the fossil record show?

Fossils provide a unique view into the history of life by showing the forms and features of life in the past. Fossils tell us how species have changed across long periods of the Earth’s history. For instance, in 1998, scientists found a fossil showing an animal at the transition from sea creature to land creature. This tetrapod had a hand-like fin, confirming a prediction of evolutionary biology. Though the fossil record does not include every plant and animal that ever lived, it provides substantial evidence for the common descent of life via evolution. The fossil record is a remarkable gift for the study of nature.

 

What is evolution?

Evolution is the biological model for the history of life on Earth. While some consider evolution to be equivalent to atheism, BioLogos sees evolution as a description of how God created all life. Evolution refers to descent with modification. Small modifications occur at the genetic level (in DNA) with each generation, and these genetic changes can affect how the creature interacts with its environment. Over time, accumulation of these genetic changes can alter the characteristics of the whole population, and a new species appears. Major changes in life forms take place by the same mechanism but over even longer periods of time. All life today can be traced back to a common ancestor some 3.85 billion years ago.

 

How is BioLogos different from Evolutionism, Intelligent Design, and Creationism?

We at BioLogos believe that God used the process of evolution to create all the life on earth today. While we accept the science of evolution, we emphatically reject evolutionism. Evolutionism is the atheistic worldview that says life developed without God and without purpose. Instead, we agree with Christians who adhere to Intelligent Design and Creationism that the God of the Bible created the universe and all life. Christians disagree, however, on how God created. Young Earth Creationists believe that God created just 6,000 to 10,000 years ago and disagree with much of mainstream science. Supporters of Intelligent Design accept more of evolutionary science, but argue that some features of life are best explained by direct intervention by an intelligent agent rather than by God's regular way of working through natural processes. We at BioLogos agree with the modern scientific consensus on the age of the earth and evolutionary development of all species, seeing these as descriptions of how God created. The term BioLogos comes from the Greek words bios (life) and logos (word), referring to the opening of the Gospel of John. “In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning. Through him all things were made.”
(Updated on March 1, 2012)

16 resources found