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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.
Cardiac Cycle Cardiac cycle has two phases-systole and diastole. Ventricular systole and diastole occur as a result of depolarization and chamber volume and pressure. The di
Which is the first (human) heart chamber into which blood enters? Where does the blood go after passing that chamber? What is the name of the valve that separates the compartments?
Does the fish heart pump venous or arterial blood? The venous blood coming from the tissues enters the atrium and passes to the ventricle that then pumps the blood towards the
when pollen tube enters the embryo-sac,it has;
T hese are some important uses of biodiversity. 1. Source of food, medicines and drugs: (a) Wheat, rice and maize are three carbohydrate rich crops and contribute
What is thigmotropism? Thigmotropism is the movement or growth of the plant in response to mechanical stimuli (touch or physical contact), as when a plant grows around a suppor
subject for botany assignment
You may have heard in the news currently that a new species of frog was discovered within a rainforest. You objective are to isolate genomic DNA and construct an expression libr
Q. What do you understand by Pericardium? Pericardium is the covering sac of the heart. The pericardium prevents acute cardiac chamber dilatation. Acute pericarditis, pericardi
Animal and Plant Cells The internal structural organisation and information related with hereditary characters and metabolic pathways are similar in all eucaryotic cells whethe
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