The longest human cell are nerve cells in the human body. Some of them run the length of the spine all the way to the toes and may be as long as 1.5m in length.
The longest cells are neurons (nerve cells) with a length of 90cm-100cm linking the central nervous system (brain and spinal cord) to other parts of the body.
While axons of the neuron are often mere micrometres thick, they can be up to a meter long (and longer in adults). This makes the neuron the longest cell in the body.
A nerve cell (particularly those forming the axions in the spine and from the spine to the foot).
On land it could be more dry. That may be a smart-alec reply, but I guess it's right. The length of a meter is always one meter.
You can't convert between units of length and units of area.
The 'meter' is the basic SI unit for length, regardless of what the length may describe.
Any of those may be used, but "meter" will result in the most convenient number.
You can find out how to use a cable length meter by reading the eHow article describing how. You may also find a short description of how to use it on the back of the packaging it came in.
The largest eukaryotic cell is the nerve cell of the Giant Squid and Colossal Squid, if largeness is being measured by length. If not being measured by length, there is another contender for largest eukaryotic cell, extremely large algae like caulerpa. These algae may grow to 10 feet in length or more, but they are still a single cell that may include up to 200 fronds.
Look up centi and meter and you may find centi meaning hundredth, and meter the basic unit to measure length. So centimeter meas hundredth of a meter.
The meter is a unit of measurement. A length is as long as it may be, a certain number of meters, or a fraction of a meter. Until the length is known in some other unit of measure, it is impossible to say how long it is in meters, unless it is right in front of you and you can measure it with a meter stick or other form of ruler.