Answer:
Due to the protozoa......
Each of these ODEs is linear and homogeneous with constant coefficients, so we only need to find the roots to their respective characteristic equations.
(a) The characteristic equation for
is
which arises from the ansatz 
.
The characteristic roots are 
and 
. Then the general solution is
where 
are arbitrary constants.
(b) The characteristic equation here is
with a root at 
of multiplicity 2. Then the general solution is
(c) The characteristic equation is
with roots at 
, where 
. Then the general solution is
Recall Euler's identity,
Then we can rewrite the solution as
or even more simply as
<u>Answer:</u>
Option C. The spread of Agriculture along the Nile river portrays Human - Environment interaction.
<u>Explanation:</u>
Nile river holds one of the oldest civilisations of the world, the agriculture was practised along this river even during the ancient times. We know that, the civilisations gradually moved and resided along rivers from the mountains. The main reason for this was the availability of water and fertile soil which best suited for the practice of agriculture.
The human life took a turn once people started living along the rivers as people moved from hunting and eating animals to agriculture and domestication of useful animals.
Thus, the agriculture along the Nile river best portrays the Human - Environment interaction.
Just took the test the answer is definitely C. <span />
Well with logical knowledge I would say to make it taste good and for energy, because bread has starch but fat has lots of energy in it
