Answer:
That would be the stomach my friend.
Answer:
Darwin conducted an experiment with breeding pigeons.
Explanation:
The pigeons provided the perfect animal to test his theory of selection for quite a number of reasons including its trait diversity from wing structures to color patterns to size to flight patterns. From these experiments he concluded that by natural selection of randomly occurring traits that make species better suited for survival and reproduction, evolve in the astounding diversity of organisms on Earth today.
<em>(not my words) </em>
The substance needed for cell energy is ATP, which is short form of Adenosine Triphosphate. This is created in the mitochondria, the energy center for the cell. It is created through the process of Cellular Respiration
Answer:
Ecology.
Explanation:
It's the study of the interaction between organisms with eachother and their environment.
Answer:
hunger thirst is an example of internal stimulus
Explanation:
so i would say getting up to get food or water is one