Answer: The food chain
Explanation: It is important to have a large number of producers and herbivores in an ecosystem because of the food chain. Without producers the herbivores would have no food. and without the herbivors the carnivores would have no food.
The group in an experiment that all the conditions stay the same is the control group.
Index Fossils of plant origin are very rare.
It is the disulphide bond.
21 is the right answer because question one and question to are not the samegvvv question of the question of what I was going through
