Scientists

The principal advantage over casual comparative or experimental designs is that they enable researchers to analyze the relationships among a large number of variables in a single study. Another advantage of correlational designs is that they provide information concerning the degree of the relationship between the variables being studied. Correlational research designs are used for two major purposes: (1) to explore casual relationship between variables and (2) to predict scores on one variable from research participants' scores on other variables.

Extreme environments have been useful to scientists in inventing PCR. It was in an extreme environment like the geysers of Yellowstone that a scientist discovered that a bacteria was living in the extremely hot water and yet still could function. Before PCR we knew we could separate a strand of DNA by heating it, but there was no polymerase to duplicate it that would work at such a high temperature. The bacteria in the hot water had a polymerase that would. So now scientists use that to do PCR and create many copies of DNA.

yes he did he had 2 children a boy and a girl

Usually, a scanning electron microscope is used to observe atoms.

Just think about this : Imagine scientists studying plants and animals of the past WITHOUT fossils. The slightest clue found on fossils leads scientists towards a conclusion that would be impossible to get without a mineralized remains of a dead organism, that we call fossils. The most important factor is the visualization of that animal or plant's shape. The foot's shape, number of bones, of a fossiled animal may give to scientists a clue on how that extinct animal could run away from predators and so on. The slightest evidence is important to reach on a conclusion when a fossil is being studied, which would be impossible without them. In other words, fossils are the linkage with the pass

Planetary scientists have a lot about Mars over the past 40 or so years of robotic exploration. The earliest probes discovered Mars is heavily cratered in the southern latitudes, as much as the Moon, but the northern latitudes are much less cratered, such that scientists began to suspect an ancient ocean was responsible for resurfacing the northern parts, erasing signs of past impacts. By counting the number of craters in a given region, we can determine the relative ages of each terrain. Combining images and topographic data, scientists can trace ancient shorelines (multiple sea levels, as the seas dried up or evaporated). Observations of the south pole revealed a frozen carbon dioxide ice cap with seasonal variations that contain a historical record of the Mars atmosphere. Mars has been and is thought to still be volcanically active. Volcanoes are present, of the kind that created Yellowstone or Hawaii on Earth; tectonism without plate tectonics. Traces of methane in the atmosphere are replenished annually, suggesting either replenishment by volcanoes or life forms. Geomorphological and structural observations show that water flowed across the Martian surface. We can have estimates of the size and composition of the core of Mars, and magnetic data showing local magnetism but no global magnetic field. Water ice has been found just below the surface in the northern hemisphere. We have some mineral maps, and radar images of the subsurface layering. In short, a lot of scientific data has been found, and piecing all that together to determine that past geological history of Mars is an ongoing endeavour.

Dichotomous key

Maria Mitchell was probably the first serious Female astronomer in the United States. among other things, she is credited with the discovery of a Comet.

Erwin Chargaff is his name

Comparative anatomy is the investigation and comparison of the structures of different animals. Scientists use comparative anatomy to study the difference between species and how they are alike in other ways.

~ann :]

because they don't have the tools and technology it isn't possible

The branch of science where there is analysis of human character based on physical features is known as morphology. This is a branch of biology which deals with specific structural features of organisms.

from amino acid to nucleic acids

rub rub ohh sex

he wrote micrographia a book about the microscopic world.

Einstein not only had nothing to do with suggesting a wave nature of electrons, he was VERY vocal in his lifelong opposition to the concept of electron waves being fundamental to their existence. He agreed they SEEMED to exhibit wave-like characteristics, he simply thought a more fundamental explanation would show this was simply an "approximation" to reality.

Louis de Broglie, in his 1924 thesis, first proposed the idea that electrons had a wave nature, with a wavelength dependent on a particle's momenutum. Experiments in 1927 showed that he was correct.

Mary Leakey was an a British archaeologist and anthropologist, who discovered the first skull of a fossil ape on Rusinga Island and also a noted robust Australopithecine called Zinjanthropus at Olduvai

1. Hypothesis
2. Data
3. Test
4. Analysis
5. -> 1. Hypothesis

A plasmid is a circular double stranded DNA usually found in bacteria. Most of them do not have specific functions and altering them does not hamper the bacteria possesing them. A gene of interest can be annealed to this plasmid so as to make the concerned bacteria produce a particular product. Since the bacteria can now produce a new product, the plasmid has been used to alter the characteristics of the organism.

Pedigrees show how characteristics are passed from one generation to the next. They are used in studying human genetics because it is not possible to carry out controlled breeding experiments with humans, as we can with other animals or with plants. Instead we have to use the natural 'experiments' carried out when people have children, and see which characteristics tend to run in a family. Of course, it is necessary to ensure that a characteristic is not caused by the common environment shared by members of the same family.

"Plants" is the scientific word for plants. If you want to know the Kingdom to which plants belong, that is Plantae.

Flora.

Scientists believe that experiments can test hypotheses and answer the specific scientific question at hand and can either support or deny the justification of a theory. Either way, the theory will always have outliers and cases that reduce its legitimacy. While a theory can become very strong in its support, scientists say that nothing can ever be 100% "proven"