4. Write the building units of the below given nutrients. a. Carbohydrates -
b. Proteins-
c. Nucleic acids -

Explanation:

1)

building blocks of Carbohydrates are monosaccharides that are simple sugars

2)amino acids are the building units of proteins there are 20 amino acids found in human body that are building blocks of proteins

3)Nucleotides are the building blocks (monomers) of nucleic acids, DNA and RNA.

the trilobite is used as an index fossil for various geologic time periods as specific types of the trilobites were present in different geological time periods. they are a group of marine arthropods belonging to the class of trilobita.

explanation:

a physical change is being made.