Records indicate the first gymnosperms likely originated in the Paleozoic era, middle Devonian period about 390 millions years ago.
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.
Answer:
Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. ... When the rocks break, the earthquake occurs.
Explanation:
Answer:
The structure your are referring to is showing the virus's genome.
Explanation:
Viruses can be described as a tiny agent which multiplies inside a host cell and is usually harmful for the host cell.
The genome of a virus might be in the form of DNA or RNA. In the figure you might be referring to, there are two strands of genome present so we can say that the virus has DNA as genome. All life of life forms, from bacteria to animals and plants can be infected by viruses.
Answer:
woodlands
Explanation:
i did a quiz on this and i got a 100