Questions

Blood is a heterogeneous mixture because the blood cells are physically separate from the blood plasma. The cells have different properties than the plasma. The cells can be separated from the plasma by centrifuging, which is a physical change.

137

Expedite means making an action fast or sooner i.e, to accomplish a work as quickly as possible.

Hence, halt means stop and it is opposite of Expedite.

Uracil is not found in DNA but found in RNA.

The caste system in India divides Hindus into four main categories - Brahmins, Kshatriyas, Vaishyas and the Shudras. The main castes were further divided into about 3,000 castes and 25,000 sub-castes, each based on their specific occupation.