Metals conduct electricity and heat, indicating that the electrons are free to move. Metals are malleable, showing that atoms are not in fixed positions but can remain bonded even though they change their positions. In metallic bonding, atoms donate electrons to a pool and all the atoms share in the pool. No compounds are formed, but the atoms are bonded into a network.
Scientists rely on embryological development patterns and adult body plans for all animals in order to classify animals. The correct option among all the options that are given in the question is the third option or option "c". It is the work of the biologists to classify animals and put them in order for studying them easily and in a group.
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Protozoa and helminths are two major groups of organisms acting as parasites and are able to cause various infections to humans. In definition, parasites are the organisms that live in or on other organisms (called host), and are capable of damaging the host. This biological relationship or the phenomenon is known as parasitism
