Ineed ! are single-celled organisms with no nucleus. the kingdom is relatively small. eubacteria are classified by are round bacterial cells. are rod-shaped bacterial cells. are spiral-shaped bacterial cells.

The correct terms are -

Bacteria

Archaebacteria

shape

coccus

bacillus

spirillus

Explanation:

Prokaryotes or the bacteria are single-cell organisms without nucleus. Their genetic material present in cytoplasm and do not distinguished by any membrane organelle.

Archaebacteria is the relatively small kingdom than other five kingdoms.

Eubacteria are classified on the basis of their shapes. Coccus are round bacterial cells. Rod shaped bacterial cells are called bacillus and spiral shaped bacterial cells are spirillus.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

the tricuspid valve is present between right atrium and right ventricle