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Explain how early RNA molecules might have been able to respond to natural selection.
Every RNA molecule might have competed with slightly dissimilar RNA molecules for nucleotides. An RNA molecule that was more successful in getting nucleotides would have an advantage, and it would pass that advantage on to the new RNA molecules it formed by replicating.
Define about the Micro Minerals? Micro minerals are those minerals, which comprise less than 0.01% of the total body weight and are required in concentrations of one part per m
Lungs - Respiration Lungs can be simple, characterised by air exchange with surrounding environment by diffusion only. These are called the diffusion lungs and are present in
explain mitosis in detail
what is an early stage of cell development
How can an organism that once underwent contact with an antigen be immunized against future infections by the same agent? This phenomenon is known as immune memory . When an a
What are the gibberellins? And where are they produced? The Gibberellins are plant hormones that stimulate plant growth, fruit formation (also parthenocarpy) and the germinatio
Why Water is a essential nutrient for life? In this unit, we learnt that water in spite of being ignored, is an essential nutrient required for life. Though the content of tota
Define Effect of feeding method on drug availability? The form in which a drug is administered or enters the body can influence its absorption, metabolism or excretion. This be
Food Gathering and Hunting : Food Gathering and Hunting In order to live, man needed to eat and to protect himself from the weather and animals. For both purposes he found it
Define the effect of Deficiency of Vitamin C? Severe ascorbic acid deficiency results in the development of the disease known as scurvy, three important manifestations of scur
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