<h3>
Answer:</h3>
Vertebrates have backbones, while invertebrates do not.
Humans, for example, are vertebrates because we have backbones.
Answer:
The lowest level, which is usually the producers.
Explanation:
This is because on every level of the trophic system, some energy is lost before the next level. So the level with the least lost energy is the lowest
Answer: <em> It cant change</em>
Explanation:
A theory does not change into a scientific law with the accumulation of new or better evidence
Yes because they are helpful to the earth
