The rules of base pairing explain the phenomenon that whatever the amount of adenine (A) in the DNA of an organism, the amount of thymine (T) is the same (Chargaff's rule). Similarly, whatever the amount of guanine (G), the amount of cytosine (C) is the same.
Answer:
It is known that observation is an initial part of the steps of the scientific method, considered as the most historical method of data collection and justified by the great evolution that the observational method has experienced in recent years.
That observation cannot be considered part of the scientific method, it is convenient to distinguish ordinary observation and scientific observation, ordinary observation corresponds to a brief mental reading that could be more projection than a real observation, being casual perceptions or occasional, without direction to hypotheses and without intentionality of seeking relationship between variables. Instead, scientific observation is one that gives rise to the problem, hypothesis, variables and others in a scientific investigation.
Likewise, the main objective of the real observation is the verification of the observed phenomenon, with the need to anticipate the error that could alter its perception. Being then, the real observation, the set formed by the perception and the interpretation, for this a good sensory integrity (senses) must be specified for a correct or real observation.
Answer:
water-vascular system
Explanation:
Echinoderms exhibit several unique features and the presence of a water vascular system is one of them. The water vascular system of these organisms consists of a network of fluid-filled canals and chambers. The marine water enters and exits the system through an opening. This system functions as a hydrostatic skeleton during locomotion.
Tube feet of these organisms are filled with fluid as water enters into them via the canals of the water vascular system lead to them. This inflates the tube feet and serve in locomotion. The water entering through the water vascular system also brings in dissolved oxygen and food particles into the body.
New farming methods use advanced technology and it is less human labor than the "traditional" farming methods.
( b ) Micronucleus has role in conjugation in paramecium.