CH4, this is because most of the dead plantai contain a sinificant number of carbon and hydrogen and they need to be digested into the cow, this process is called enteric fermentation, some of these molecules aren't digested and are excreted.
<span> Very inefficient. Almost 90% of all energy is lost between trophic levels. That is why larger animals need to eat more, because less energy is being consumed. </span>
