Insulin causes
a) a decrease in the concentration of blood glucose.
b) a decrease in the permeability of cell membranes to glucose.
c) an increase in the production of glucose from glycogen.
d) an increase in the concentration of blood glucose.
e) none of the above.

Secretion of glucagon causes  an increase in the concentration of blood glucose

Secretion of a decrease in the concentration of blood glucose.

Explanation:

So the answer is A). a decrease in the concentration of blood glucose.

as a camel goes without food, its hump begins to shrink. its fur prevents the camel from sweating too much.camels store fat in their humps, not water.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.