Explanation

Octopus has blue-colored blood because it contains hemocyanin, which is copper-based.

Hemocyanin turns blue when oxygenated, unlike iron-based hemoglobin.

Explanation

A post-colonial state is a nation that has gained independence from colonial rule. 

Post-colonialism is a theoretical framework in social and political thought that deals with the cultural, political, and economic legacies of colonialism and imperialism, both before and after the formal end of colonial rule

Explanation

Explanation

The study of parasites is called Parasitology.

It is a branch of biology focusing on parasites, their hosts, and their relationships, often studied in microbiology and veterinary science for diagnosis and treatment of parasitic diseases.

Explanation

Water has maximum density at 4°C.

When Water is in its Solid form (Ice) below 0°C.