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How did scientists probably date these fossils and the species they represent?
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What is the name of the Theory that supports Continental Drift?
1.Fossils were found of the same species that they could not live today.2.Scientists could fit the pieces together much like a jigsaw puzzle.3.Glacial forms have been found in different continents that are similar.
Why do scientists keep track of populations?
By analyzing all this data, scientists can learn new ways to help control animal populations, determine what impact development might have on an animal population, and determine if there are enough individuals of a particular species in an area to allow for reproduction.
How do scientists classify new species?
By applying the science of classification which is called Taxonomy. The person would gather data pertaining to the characteristics of the species, both quantitative and qualitative. The data can then be applied to a dichotomous key or interpreted by a method called cladistic analysis. Also DNA comparisons can now be made, even in plants.
How does an earthworm get rid of liquid waste?
The annelids ( also called Ringed Worm ), collectively called Annelida (from French annelés "ringed ones", ultimately from Latin anellus "little ring"[1]), are a large phylum of segmented worms, with over 17,000 modern species including ragworms, earthworms and leeches. They are found in marine environments from tidal zones to hydrothermal vents, in freshwater, and in moist terrestrial environments. Although most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include earthworms) and leech-like species, research since 1997 has radically changed this scheme, viewing leeches as a sub-group of oligochaetes and oligochaetes as a sub-group of polychaetes. In addition, the Pogonophora, Echiura and Sipuncula, previously regarded as separate phyla, are now regarded as sub-groups of polychaetes. Annelids are considered members of the Lophotrochozoa, a "super-phylum" of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans.The basic annelid form consists of multiple segments, each of which has the same sets of organs and, in most polychaetes, a pair of parapodia that many species use for locomotion. Septa separate the segments of many species, but are poorly-defined or absent in some, and Echiura and Sipuncula show no obvious signs of segmentation. In species with well-developed septa, the blood circulates entirely within blood vessels, and the vessels in segments near the front ends of these species are often built up with muscles to act as hearts. The septa of these species also enable them to change the shapes of individual segments, which facilitates movement by peristalsis ("ripples" that pass along the body) or by undulations that improve the effectiveness of the parapodia. In species with incomplete septa or none, the blood circulates through the main body cavity without any kind of pump, and there is a wide range of locomotory techniques - some burrowing species turn their pharynges inside out to drag themselves through the sediment.Although many species can reproduce asexually and use similar mechanisms to regenerate after severe injuries, sexual reproduction is the normal method in species whose reproduction has been studied. The minority of living polychaetes whose reproduction and lifecycles are known produce trochophore larvae, which live as plankton and then sink and metamorphose into miniature adults. Oligochaetes are full hermaphrodites and produce a ring-like cocoon round their bodies, in which the eggs and hatchlings are nourished until they are ready to emerge.Earthworms support terrestrial food chains both as prey and by aerating and enriching soil. The burrowing of marine polychaetes, which may constitute up to a third of all species in near-shore environments, encourages the development of ecosystems by enabling water and oxygen to penetrate the sea floor. In addition to improving soil fertility, annelids serve humans as food and as bait. Scientists observe annelids to monitor the quality of marine and fresh water. Although blood-letting is no longer in favor with doctors, some leech species are regarded as endangered species because they have been over-harvested for this purpose in the last few centuries. Ragworms' jaws are now being studied by engineers as they offer an exceptional combination of lightness and strength.Since annelids are soft-bodied, their fossils are rare - mostly jaws and the mineralized tubes that some of the species secreted. Although some late Ediacaran fossils may represent annelids, the oldest known fossil that is identified with confidence comes from about 518 million years ago in the early Cambrian period. Fossils of most modern mobile polychaete groups appeared by the end of the Carboniferous, about 299 million years ago. Scientists disagree about whether some body fossils from the mid Ordovician, about 472 to 461 million years ago, are the remains of oligochaetes, and the earliest certain fossils of the group appear in the Tertiary period, which began 65 million years ago.
How many species of worms are there?
Invertebrate various phyla, everyday earthworm probably Phylum Annelida
How does the study of fossils represent the evolution of species over geological time?
The study of fossils represent the evolution of species by the time period between when they became fossils and what the ancestory line is
Why are species missing from the fossil record?
because sometimes the scientists don't find the fossils
Why will scientists never know about all the species on earth?
Most organisms never became fossils
Most of what scientific know about extinct species is based on?
Most of what scientists know about extinct species is based on the study of bones and fossils. Scientists have studied many dinosaur bones to determine what they ate and how they lived. Fossils tell what the land was like at a given time in history.
What have scientists from fossil records?
Fossils were of grear interest to early scientists because there: * appered to be of unusual, unknown organisms that were no longer living * are no fossils of most living species * buried very deep within rock more than 1km
By comparing fossils in higher sedimentary layers with fossils in lower sedimentary layers scientists can learn what?
I.which types of organisms were more common during various time periods.II.how species have evolved over time.III.the relative age of different species. there it is
To compare the relative ages of fossils scientists sometimes use an easily recognized species called?
To compare the relative ages of fossils, scientists use an early recognized species called an index fossil. An index fossil must have existed for a short period time and must have covered a wide geographical range.
How do fossils help scientist learn about history?
Fossils provide valuable information about past organisms and environments, helping scientists understand evolutionary history, species diversity, and the Earth's changing climates over time. By studying fossils, scientists can reconstruct past ecosystems, track evolutionary patterns, and uncover the timeline of life on Earth.
How do scientists use similarities in early development as evidence for evolution?
By examining fossils and by determining their relative and absolute ages, scientists have collected evidence that supports the theory that species changed over time.
Are there any fossils found in Nevada?
Probably, yes. California has some of the largest concentrations of Smilodon fossils in the world and I would assume that, with its close proximity, Nevada would have some too.
What have scientists learned about past life on earth from the fossil record?
Scientists have learned about extinct species, what they looked like, their geographic distributions, their relative abundances, how they lived, and their period of existence.
How do fossils help scientists learn what happin in the past?
Scientists can learn from a fossil of animal by its age, diet, and physical characteristics, depending on the condition of the fossil. For example, scientists would not be able to tell of a hominid was a new species or not if a few bones were missing, because of the fact that they could determine different or similar traits than other species of hominid.
