* A radioisotope like 14-carbon can be used to detect the age of a biological material less than 50,000 years old.…
Potassium-Argon dating is a form of radiometric dating which tells us the absolute age of rocks. Practically all elements are radioactive to some extent, some more than others. Moreover, different isotopes of elements are more radioactive than others. Isotopes are forms of a particular atom that varies in the number of neutrons in the nucleus. For instance, K-40 is a naturally occurring isotope of Potassium is far more radioactive than its siblings K-39 and K-41 because K-40 is much less stable.…
← vestigial – structures that were once used in ancestral species, though overtime the organism would stop using them (whales leg bone)…
Synapomorphies: a shared, derived trait found in two or more taxa that’s present in their most recent common ancestor…
Radiometric dating of fossils is a method where slow decay occurs in half life and can be measured to calculate age of the fossil…
Diatoms are single cellular eukaryotes that are super tiny in size. They are pretty much like photosynthetic micro-organisms, some live simple or branched and others are filamentous and others are in a gelatinous envelope or tube. All diatoms are enclosed by something that is called frustule, which is made up of 2 valves that are fitted together by a girdle, which is a connective zone.…
Radiometric dating is the process of estimating the age of rocks from the decay of radioactive elements inside the rock specimen. This process utilizes radioactive isotopes to date igneous rocks. These radioactive isotopes have a distinctive number of atoms that present themselves unstable.…
Biological species concept - All members of one species can mate with one another, and result in viable off-spring. Problems with this: 1. Asexual organisms, 2. Extinct organisms, 3. What about those hybrids?, 4. Ring species/circular overlap…
Adaptation is an inherited characteristic that improves an organism’s ability ti survive and reproduce in a particular environment.…
Fossils which are any and all traces of a past life and fossil records are fossilized remains of organisms that lived in the past, and the people that look and study these remains of a past world are paleontologist, they are men and women who study extinct organisms based on their fossilized remains.…
Evolutionary theory explains the existence of homologous structures adapted to different purposes as the result of descent with modification from a common ancestor. Similarities and differences among homologous structures help determine how recently species shared a common ancestor. For example the front limbs of reptiles and birds are more similar to each other than either is to the front limb of an mammal. This similarity indicates…
archeological findings that support the events that take place all the way back in the Old…
- Homologous Structures: anatomical structures that occur in different species and that originated by heredity from a structure in most recent common ancestor of species.…
The author and his colleagues specifically chose to focus on 375 million year old rocks in their search for fossils because this was the time frame that provided fish that would be useful to study from. The 385 million year old rocks provided fish that look too similar to the ones we have now and the 365 million year old rocks have fossils that don’t resemble fish. The 375 million year old rocks, however, provide fossils that show the transition between fish and land living animals. Sedimentary rocks are the type of rock that preserves the fossils. Limestone, siltstone, shale, and sandstone are examples of this. The reason why these rocks are the best at preservation is because they are formed by a process that includes the movement of lakes, rivers, and seas. A rock in a body of water has the potential to fossilize because after the gradual compression on the layers in the body of water forming, chemical processes are still happening.…
It is complementary to the behavioral perspective because some behaviors may enhance the chance to survival.…