PHANERITIC TEXTURE - Igneous rocks with large, visible crystals because the rock formed slowly in an underground magma chamber. PORPHYRITIC TEXTURE - an igneous rock in which PHENOCRYSTS (large crystals) are surrounded by a fine groundmass (very small crystals).
Commensalism. the symbiont benefits and the host is unharmed.
The study of body parts include anatomy physiology histology and embryology
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Answer:
<em>D) lining up of chromosomes in the cell</em>
Explanation:
Prophase can be described as the first stage of cell division. During this phase, The chromatin material condenses and becomes compact so that the chromosomes become visible. The nuclear envelope disintegrates and the nucleolus disappears. Hence, the choices mentioned in option A, B and C occur by the end of prophase.
Metaphase is the third phase of cell division. During this phase, the chromosomes line themselves in the centre of the cell. Hence, the lining of the chromosome does not occur by the end of prophase. This occurs during the third stage.
The correct answer is (c) Small amounts of a mutagen often do not have an effect on health.
The doctor will explain that small amount of mutagen(x-ray) often do not have any severe health issues. Radiologists are trained to use the optimal amount of x-rays required for the procedure and this amount is very less. Properly carrying out the whole procedure minimizes the risk. The amount of radiation used is small and is turned off soon after the procedure is completed. So, small amount of x-ray exposed for a very short period of time is not risky.