1) What is the term for two chromosomes that have the same length, shape and genes,
but do NOT have exactly the same DNA
sequence?
A) sister chromatids
B) centrioles
C) homologous chromosomes
D) haploid chromosomes
E) centromeres

Explanation is in the file

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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.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this