I would say D, but I could be wrong
She was running harder than she usually does, so she worked up a sweat.
Her body needed to burn food more quickly to get energy to run hard.
Her body needed to use more heat energy
Answer:
Key stone Species
Explanation:
Keystone Species are the ones which impact the entire ecosystems and all the organisms with in it.
Keystone species are responsible for maintaining the overall structure and function of the ecosystem.
For example – small predators in any ecosystem which feed upon the herbivores organism in order to preserve the plant species act as key species. Their presence is essential for maintaining the dominant plant species in the ecosystem
1. The heart muscle cells need plenty of oxygen and nutrients so it needs its own blood supply.
2. The heart needs to have a blood supply to get ride of wastes.
Hope that helps. -UF aka Nadia
