Fungal spores
a. are only asexually produced.
b. cannot be seen in a light microscope.
c. are used to identify fungi.
d. are produced by molds but not by yeasts.
e. are only produced under harmful environmental conditions

c. they are used to identify fungi

Explanation:

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.

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.