Two Pieces of Evidence to Support Author's Claim:
Bacteria make nutrients available to the body.
This supports the claim because it suggests that certain bacteria play a positive role by contributing to the availability of essential nutrients for the human body. This implies a symbiotic relationship between humans and bacteria.
Bacteria keep human immune systems working.
This evidence reinforces the author's claim by highlighting that some bacteria contribute to the functionality of the human immune system. It implies that these bacteria play a protective role in maintaining human health, further supporting the idea that not all bacteria are harmful.
In conclusion, the evidence presented in the passage strongly supports the author's claim that some bacteria are beneficial to human health.