in what way is observation important in ecolo
How is observation important to ecological inquiry? Obs...
Drilling predators such as snails, slugs, octopuses and beetles penetrate their prey’s protective skeleton and eat the soft flesh inside, leaving behind a telltale hole in the shell. Trillions of these drill holes exist in the fossil record, providing valuable information about predation over millions of years.
Incompleteness of the Fossil Record
The number of species known about through the fossil record is less than 5% of the number of species alive today. Fossilized species may represent less than 1% of all the species that have ever lived.
The fossil records suffer from 3 types of bias: temporal bias, geographic bias and taxonomic bias. Fossil of certain geologic time may be easier to find as compared to those or other era, such as newer fossils are easier to find than older ones. Plate tectonics causes loss or displacement of fossils.
Some people (who are typically not biologists) think that the gaps in the fossil record present a problem to the theory of evolution, because they do not show a gradual and smooth change of one species changing into another. that species do not change gradually, but “abruptly”!
reconstruct the evolutionary history of a group of organisms over millions of years. Why is the fossil record NOT a complete catalog of biological history? Not all organisms fossilize with equal probability. … The probability that an organism will be fossilized varies among species and environments.
For the fossil record to be a complete reference for past life, we’d need to have a record for every organism that ever lived on the planet. Fossils are very rare. Not every organism will turn into a fossil because the process of fossilization requires very specific environmental, geological, and biological conditions.
Fossil evidence for human evolution will never be complete, as fossils themselves are rare geologic occurrences. Nevertheless, by incorporating other scientific disciplines, we’re able to build an increasingly accurate picture of just what our evolutionary family tree consisted of.
The fossil record is, broadly speaking, very incomplete and we probably only see a small fraction of life forms that existed in any given geological time period. … However, known fossil sites can still produce new discoveries as weathering and erosion expose new fossils.
The fossil record helps paleontologists, archaeologists, and geologists place important events and species in the appropriate geologic era. Therefore, some discovered fossils are able to be dated according to the strata, a distinct layer of rock, that they are found in. …
fossil record. information about past life, including the structure of organisms, what they ate, what ate them, in what environment they lived, and the order in which they lived. extinct. no longer existing or living. relative dating.
Both theories claim that they can explain the gaps in the fossil record. The Gradualism theory states that the fossil record is incomplete and that it is unlikely that all stages of evolution would be preserved let alone found. However there have been a few species that show Gradualism through the fossil record.
The fossil record of human ancestors may go back 6 million years or more, and the genus Homo arose at least 1.8 million years ago when australopithecines evolved into human ancestors known as Homo habilis.
They say the fossil record fails to show what are called “transitional forms,” generally the in-between stages as one type of creature evolved into another. The fossil record certainly has gaps, mostly because the conditions required to create fossils have been rare ever since life began on Earth.
The child of Turkana, an almost complete fossil – just missing hands and feet– 1.6 million years old, from what some scientists call Homo ergaster, an early African population of Homo erectus, is considered the most complete skeleton of a prehistoric human ever found.