Some yes,some,no. There are uesful and not-so-useful in both sexes. It really depends on your definition of "useful".
Biogas is useful because it means that our carbon footprint is smaller. It consists of methane and carbon dioxide which is found naturally in animal dung, so we're not adding anything more to the atmosphere. Compared with petrol and diesel, the emissions are much smaller. Also in LEDCs where there is more livestock it is a cheaper way to generate fuel.
Plants also give us wood.This wood is used for various purposes.It is used for making furniture and other useful items.
The size depends on the amount of DNA stored in the cell. :)well, I believe it's because if a cell is too big, it has to feed more. As the surface area increases, so does the volume, remember. So think of a balloon. The surface area is very tiny compared to the volume, correct? So, the cell is so tiny because if it were even , say, the size of a quarter, it would have to feed a WHOLE lot to keep from starvation.... I'm pretty sure that's it. So you see, the DNA keeps the cell from starvation.There has to be enough DNA to code for metabolism so the cell can grow.If a cell had unlimited space, it could not be able to perform functions needed to live. The cell's DNA is limited depending on how fast the volume of the cell decreases/ surface area decreases.jhdhjdhdkkdkdkh
Before the cell theory it was pre-renaissance. The renaissance was the boom of art and science. So, before the cell theory was religion.
because they are used to provide water and electricity for the spaceship... so very useful....
Without fuel, the spacecraft cannot launch.
Fuel is so useful to spacecrafts because without the fuel the spacecraft would not go.
A fuel cell is a device that converts the chemical energy from a fuel into electricity through a chemical reaction. It is useful in spacecraft because it provides a reliable and efficient way to generate power in space without the need for combustion. Fuel cells have high energy density, are lightweight, and produce clean electricity, making them ideal for use in space where reliability and efficiency are crucial.
A fuel cell is different from a battery cell in so far as reactants are constantly supplied to a fuel cell making it an open system whereas a battery cell is a closed system that stores the reactants within it. A fuel cell works as long as fuel is supplied to it whereas a battery cell requires regular replacements.
A fuel cell is different from a battery cell in so far as reactants are constantly supplied to a fuel cell making it an open system whereas a battery cell is a closed system that stores the reactants within it. A fuel cell works as long as fuel is supplied to it whereas a battery cell requires regular replacements.
because it is to do with other planets but mostly mars and galexy if we had the tehcnical difficultys in the balance of time, timeloards from doctor who would come back to life if we belived.
because it is to do with other planets but mostly mars and galexy if we had the tehcnical difficultys in the balance of time, timeloards from Doctor Who would come back to life if we belived.
so they can go out on mars and other planets
A fuel cell is different from a battery cell in so far as reactants are constantly supplied to a fuel cell making it an open system whereas a battery cell is a closed system that stores the reactants within it. A fuel cell works as long as fuel is supplied to it whereas a battery cell requires regular replacements.
Fuel cell vehicle is the vehicle which is using fuel cell stack as a moving force instead of conventional combustions engines. They can be fed by H2 - so it will hydrogen fuel cell, or work on the solid oxide fuel cell principles. We have published several article at our website http://fuelcellsinfo.com Please check
Kinda-sorta, but not really. Water can be divided into hydrogen and oxygen, which can be either burnt or used in a so-called fuel cell. But so far this process isn't efficient enough to be useful.