Answer:
Questions, hypotheses, and ideas should be tested against observable evidence.
Explanation:
Skepticism is extremely important, if not fundamental, in all areas of Science. This attitude is based on the belief that all questions, hypotheses, and ideas should be tested against observable evidence. Moreover, it allows scientists to <u>question and think thoroughly about all possibilities behind a phenomenon, instead of just 'believing' any observation or vague and non-supported reason that explains it.</u>
In addition, it allows researchers to investigate all possibilities and test numerous methodologies to be certain and gather enough evidence to explain this certain phenomenon.
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I would choose nuclear DNA. I see it as more complex and will yield to more markers to rely on. The Mitochondrial DNA has less of various paths as it is passed from the mother onto her babies. This concept would be different in terms of identical <span>twins.</span>
The answer is cotton. It is natural because it is grown and easily woven in to clothes :)
Answer:
These agents are known as teratogens.
Explanation:
Teratogens impair or cause abnormal development and growth of the embryos or fetuses exposed to them. During prenatal development, the embryonic stage is the most susceptible to teratogens because at this time there is formation of major organs and limb buds. Birth defects are a common sign of such exposure.
Answer:
a. Tetrapods were no longer tied to the water for reproduction
Explanation:
The amniotic egg is hard-shelled and is called an amniotic egg because the embro develops within a sac called amnion.
Amphibians were first tetrapods to invade the land. The need to return to water for reproduction limited their distribution. Amniotes evolved an egg that broke the tie to freshwater.
Amniotic egg contains a series of extraembryonic membranes (Amnion, allantois, chorion, yolk sac) that, among their features , takes the aquatic environment with the egg.
Hence a. Tetrapods were no longer tied to the water for reproductionis believed to be the most significant result of the evolution of the amniotic egg.