It would be a young puppy learns to beg for food by watching a older dog
Answer:
Due to no resistance.
Explanation:
Most mosquitoes perish when DDT chemical was sprayed the first time because these mosquitoes are vulnerable to the DDT chemical and there is no resistance present in their body against this chemical. DDT chemical is an insecticide which is used against insects or pests that causes damage to human, organisms and crops. DDT was first synthesized in 1874 by the Austrian chemist named Othmar Zeidler.
Producers, because they're the start of the food chain and without them there will be no food chain.
Answer:
the combination of ideas to form a theory or system.
Explanation: