The young tomato plant doesn't have enough energy to pull more leaves out after its already grown a stem, very hot temperatures will stunt the growth of the tomato plant because of this.
All of the above points are valid for fossils' contributions in understanding the process of evolution. They allow us to study the ancestry, we can see the homologous organs or structures, if fossils are well-preserved; different fossils can lead us to follow the cycles of the changes that occurred during macroevolutions, and fossils can be used to study different populations which had different body structures for surviving in different environmental conditions.
With what do you need help in, like the subject to indentify
Pure substance can be classified as or compounds?
Answer: elements