<u>Answer:</u>
- few nutrients
- high pressure
- low temperatures
<u>Explanation:</u>
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 mouth" is the correct answer
Mostly by respond to stimuli. so its like it reacts to environment and do different actions
The correct answer is <em></em>ii.
The pharyngotympanic tube or else eustachian tube is a structure of the middle ear, which connects the nasopharynx with the middle ear. The function of this structure is to equalize the pressure and drain the mucus produced by the middle ear.
