Explanation:
The higher the volume of water in a stream, the higher its speed and the wide its size and shape which ensures a proportionate flow rate.
To quantify how the speed of stream, we use the quantity, discharge in hydrology;
Discharge is the volumetric rate of water flow past a point at a particular time.
Discharge = 
- We see that discharge is directly proportional to the volume of water in a stream.
- It is inversely proportional to the time taken.
- We know that volume is the amount of space occupied by a body. It is function of its size and shape.
- A big water body that is deeper, wider and longer will have more wate and a greater discharge.
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<u>Answer:</u>
Fossils are the sources to learn the changes on the earth and how much it changed in these years. Its provides us with information about the existence of plant and animals in the past.
Actually, the fossils we found till the date are the ancestors of the plants and animals that live today. Moreover, some fossils of animals are easily identifiable since they exist till the date.
But there are fossils of animals that exist no longer in the earth. By studying and analyzing the fossils, one can tell how life on the earth has changed.
Also, we can learn about the ancestors of the plants and animals and how their long life existed on earth.
In other words, one can learn where and how those organisms were lived. So that we can know about our ancient environments.
I think it is true not 100% sure but i believe it is true <span />
Even if a microorganism is a part of the normal microbiota of a human being, it may cause the death of the person. For example, say E. coli, it resides in intestines and is harmful. But, if its number increases way too large, it may cause infection (Colitis) and even death. So, even the normal microflora needs to be present in the controlled quantities, inside the body.
