Answer: Option A "Choroid plexus".
Explanation:
Cerebrospinal fluid can be defined as the fluid that is found in the brain and spinal cord of human beings. It is a clear and colorless fluid.
The production of cerebrospinal fluid takes place by the specialized ependymal cells that lies in the choroid plexuses which is present in the ventricles of brain.
The amount of cerebrospinal fluid in a day is 500mL. This fluid acts as cushion that protects the brain from mechanical and immunological protection.
Hence, the correction answer is option A
1st image I think would be the answer
Answer: All of the mentioned Scientist made considerable contributions to understanding the DNA molecule in the order:
Explanation: 1.Fredrick Griffith
2. Avery, McCarty and MacLeod
3.Chargaff
4.Hershey and Chase
5.Watson and Crick
Typical chemical formula for beta d galactose is 
with a double bond to oxygen at the <u>1st</u> carbon in the fisher projection.
A stereo formula can be represented in two dimensions using Fischer projection and Fischer projection formula despite losing the stereochemical information, including absolute configuration, near chiral centers.
Galactose lies in the D- configuration if the hydroxyl group (-OH) in carbon 5 appears on the right side with the Fischer projection. Galactose becomes L-sugar whenever the hydroxyl group of carbon 5 occurs on the left side with the Fischer projection.
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