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In the upper course of the river the river is beginning so is narrow, shallow and low energy. This low energy causes sediment to not move and therefore pebbles and rocks aren't moved by the waters action....

Viruses are parasitic organisms that cannot survive outside a living host. They are considered to be non-living, however this still remains debatable amongst virologists. They infect their host and utilis...

f(g(x))=2(cx+5)+c

fg(x)=2cx+10+c

2cx=6x

2c=6

c=3

10+c=d

d=13

Multiply whole equation by 2

6y + 4x = 12y - x

Take 6y from both sides

4x = 6y - x

Add x to both sides

5x = 6y

divid both sides by 5

x = 6/5(y)

There would be variation in the length of necks in the early giraffe population.

Those who had longer necks would have an advantage for survival as they would be able to reach higher into the trees...