C.

incus, malleus and stapes

Ear ossicles are three small non- supporting bones of body, present in middle ear of human. They are responsible for transmitting and amplifying vibrations received from tympanum.

D.

Ribosome

Virus is a nucleoprotein particle. It is made up of an outermost covering known as envelope, a protein coat, ie, capsid and a core of nucleic acid. During its reproduction, multiple cpoies of envelope capsid and nucleic acids are formed inside the host cells.

Since, ribosomes are absent in virus cells. Therefore, they are not reproduced during reproduction of viruses.

B.

marine animals

All members of Phylum- Echinodermata are marine. Therefore, Echinoderms are marine, spiny skinned animals. They have water vascular system for locomotion, eg, starfish, Antedon.

Arboreal insects lives on trees. Freshwater forms are animals or plants living in fresh water of ponds, eg, Hydrilla.

C.

oxygen goes directly into tissues by diffusion

Class- Insecta of Phylum- Arthropoda, is characterised by the presence of three pairs of legs and absence of respiratory pigments in blood, eg, cockroach, mosquito.

In cockroach, respiration is aerobic and oxygen goes into tissues by diffusion through the trachea.

A.

starfish

Tube feet are extensible tubular processes bearing suckers and present in rows on the under surface of Echinoderms. These are connected internally with water vascular system. Each tube foot has an ampulla, a podium and a sucker. These are sensory structures that take part in adhesion, locomotion, respiration and food capturing. 

Jelly fish is a member of Phylum- Coelenterata. Scoiliodon is a fish and silver fish is an arthropod.