Answer: Research the information using the several sources before one starts taking the supplement.
Explanation:
The new herbal supplement in the market that claims to build immunity. Any supplement in the market cannot just claim that it is a supplement which can be used to prevent illness.
It should be proven by some research that the supplement is capable of building immunity in the body.
The supplement should have proper prove on the container in order to claim such information.
I am going to assume you meant the "first trophic level" of the ecosystem. The first tropic level of an ecosystem is made up of producers, so the answer is C, Acorns.
