<P> The forest floor , the bottom-most layer , receives only 2 % of the sunlight . Only plants adapted to low light can grow in this region . Away from riverbanks , swamps and clearings , where dense undergrowth is found , the forest floor is relatively clear of vegetation because of the low sunlight penetration . This more open quality permits the easy movement of larger animals such as : ungulates like the okapi ( Okapia johnstoni ) , tapir ( Tapirus sp . ) , Sumatran rhinoceros ( Dicerorhinus sumatrensis ) , and apes like the western lowland gorilla ( Gorilla gorilla ) , as well as many species of reptiles , amphibians , and insects . The forest floor also contains decaying plant and animal matter , which disappears quickly , because the warm , humid conditions promote rapid decay . Many forms of fungi growing here help decay the animal and plant waste . </P>
<P> The forest floor , the bottom-most layer , receives only 2 % of the sunlight . Only plants adapted to low light can grow in this region . Away from riverbanks , swamps and clearings , where dense undergrowth is found , the forest floor is relatively clear of vegetation because of the low sunlight penetration . This more open quality permits the easy movement of larger animals such as : ungulates like the okapi ( Okapia johnstoni ) , tapir ( Tapirus sp . ) , Sumatran rhinoceros ( Dicerorhinus sumatrensis ) , and apes like the western lowland gorilla ( Gorilla gorilla ) , as well as many species of reptiles , amphibians , and insects . The forest floor also contains decaying plant and animal matter , which disappears quickly , because the warm , humid conditions promote rapid decay . Many forms of fungi growing here help decay the animal and plant waste . </P>
which of the following is most likely to be a limited resource on the floor of a tropical rainforest
which of the following is most likely to be a limited resource on the floor of a tropical rainforest
sunlight
sunlight