Answer:
One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos. During the first three minutes of the universe, the light elements were born during a process known as Big Bang nucleosynthesis.
Answer:
In the frog, Rana, venous blood is driven into the right atrium of the heart by contraction of the sinus venosus, and it flows into the left atrium from the lungs. A wave of contraction then spreads over the whole atrium and drives blood into the ventricle, where blood from the two sources tends to remain separate.
Explanation:
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Answer:
Because of the several steps with high temperatures and also (heavy ) changes in temperature.
Explanation:
PCR consists of a serie of 20–40 repeated temperature changes. Those series or cycles are also called thermal cycles.
The individual steps (common to most PCR methods) are as following:
→Denature template : 99 °C for 2 minutes
→Anneal primers to template : 55 °C for 2 minutes
→Extension of the primers by heat stable DNA polymerase :72 °C for 2 minutes
As we can notice, will in a relatively short time, different temperatures be used. It's important that the used polymerase will be functional at corresponding temperatures, as well as (heavy) temperature changes.
→ Since the bacteria Thermus aquaticus lives near thermal vents in the ocean floor and grows at temperatures of up to 98°C, it's used to corresponding temperatures.
If other enzymes will be used, i.e enzymes functional in lower temperatures (several) steps will not continue or will not be executed properly. To avoid this it's important to use the best temperature resistant enzymes.
A biological community depends upon the abiotic factors such as temperature, relative humidity, light, etc for their survival. Disturbances that occur in the environment such as fire, flood, drought, etc also damage the biological community. The biological community that can withstand in the prolonged drought condition survives while those are sensitive dies.
Due to prolonged drought, the water table of that area will decrease and no water will be available for consumption by animals and humans. Prolonged drought also affects the aquatic environment such as ponds, rivers, etc.
Scarcity of water and uncommonly dry weather are two factors that occurs due to prolonged drought. This will cause increase in mortality of crops and livestock. This will ultimately affect the agriculture of that area. The cattle are also affected by prolonged drought due to unavailability of fodder crops.
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