It would be B. the mixture became warm, as a change in temperature is certain evidence that a chemical reaction has taken place.
(it would be helpful if you marked me as brainliest) :)
Answer:
Viruses are tinier than bacteria. All viruses have is a protein coat and a core of genetic material, either RNA or DNA. Unlike bacteria, viruses can't survive without a host. They can only reproduce by attaching themselves to cells.
Answer:
It also provides an extremely stable backbone with the negatively charged phosphates pointing to the outside of the molecule. This charge aids in the attachment of other molecules to the strand of DNA. DNA double helix allows it to be stable and it won't easily destroyed.
Energy flows from the first tropic level(the producers) to the consumers to decomposers then the cycle begins
