Answer:
Clean rooms are used for biological research in order to prevent the research from contamination of other microorganisms.
Explanation:
Rooms were cleaned before any biological research in order to reduce the intervention of other microorganisms in the research and made the research proof from any impurities. These labs have high atmospheric pressure which decline the growth of microbes and the research will be done in a better way.
Answer:
Probability of having a child with this genotype: CcFf is 
Explanation:
Given -
Curly hair (C) is dominant to straight hair (c)
and
Freckles (F) is dominant to not having freckles (f)
Genotype of man heterozygous for curly hair and no freckles is Ccff
Genotype of woman with straight hair and heterozygous condition for freckles is ccFf
The cross is between Ccff and ccFf
The following offspring would be produced
Ccff and ccFf
Cf Cf cf cf
cF CcFf CcFf ccFf ccFf
cF CcFf CcFf ccFf ccFf
cf Ccff Ccff ccff ccff
cf Ccff Ccff ccff ccff
Genotype –
CcFf – 4 in number
ccFf - 4 in number
Ccff - 4 in number
ccff - 4 in number
Phenotype
CcFf – heterozygous for both the curly hairs and freckles
ccFf – straight hairs with heterozygous freckle condition
Ccff – Heterozygous curly hair with no freckles
ccff – staright hairs with no freckels
probability of having a child with this genotype: CcFf is

Through Photosynthesis larger molecules are formed
C is the answer you are looking for.
Answer:
They help us heal wounds we have
Explanation: