Evolution


December 3, 2007
46 Views

Evolution: a never ending process

Most scientists date the appearance of life on our planet at around 3.5 billion years ago.  A fraction of these life forms left traces, or fossil forms, for us to find. If there is one conclusion we can draw from reviewing the story of life, it is the fact that it was subject, and continues to be subject, to change.

It is safe to say that as long as there is life on our planet, it will change over time. In other words, it will evolve.

This notion of an ongoing process of change has important implications. It renders the expression of “missing link,” or “intermediate fossil” meaningless.

Quite often, scientists who study and teach evolution are challenged to show such intermediate fossils, with questions like “Mommy, Did Apes Evolve from Dogs?” Questions like these are then followed by statements like “Scientists cannot produce the fossils of half-evolved dinosaurs or other creatures.”

The challenge is clear: unless one can produce these half-evolved creatures, whatever they are supposed to look like (an ape with a dog’s head?), then the concept of evolution must be wrong. One needs to realize, however, that the way in which the question is posed is misleading.

In an earlier blog I referred to all of us a being mutants. This tongue-in-cheek statement makes the point that we are all unique because of a small number of mutations that set us apart from our parents. The mechanism that supports evolution resides in the tiny genetic changes that occur as a result of mutations – not from a sudden appearance of a different body type or part.

However, when these small changes are allowed to accumulate over vast amounts of time – say millions of years – the results can be significant. The fossil record tells us that these results were, in fact, very significant: hundreds of thousands of animal and plant species flourished and perished over the last 3.5 billion years.

Each species exhibited tiny mutations in each generation. Sometimes, the results of the mutation gave that species an advantage that allowed it to survive where others did not – thus allowing it to continue to impact the story of life on Earth.


Dirk
Authored By Dirk Van Tuerenhout

As curator of anthropology, Dirk is responsible for the museum’s artifact collection and is involved in its temporary and permanent anthropology exhibits. Dirk is an expert in human cultures; he curates the Museum’s Hall of the Americas and specializes in native American cultures like the Aztec and Maya.

Leave a Reply

Your email address will not be published. Required fields are marked *

Become An HMNS Member

With a membership level for everyone; Don't just read about it, see it.

View All Membership Levels

Editor's Picks New Special Exhibition at HMNS – Vanishing Arts: Highlights from the Beasley-Hwang Collection Your Spring Break Guide for a Fossil-filled Visit to HMNS Google’s Field Trip Days At HMNS Missed Connections: Malachite And The Ancient Egyptians Everything you need to know about the Hubble Telescope Raptors – Group Hunters or Cannibals?
Follow And Subscribe

Equally Interesting Posts




HMNS at Hermann Park

5555 Hermann Park Dr.
Houston,Texas 77030
(713) 639-4629


Get Directions Offering varies by location
HMNS at Sugar Land

13016 University Blvd.
Sugar Land, Texas 77479
(281) 313-2277


Get Directions Offering varies by location
George Observatory

21901 FM 762 Rd.
Needville, Texas 77461
(281) 242-3055

Hours
Tuesday - Saturday By Reservation
Saturdays 3:00PM - 10:00PM
Saturdays (DST) 3:00PM - 11:00PM
DST = Daylight Savings Time.
Please call for holiday hours. Entry to Brazos Bend State Park ends at 9:30 p.m. daily
Get Directions Offering varies by location

Stay in the know. Join our mailing list.