I suggest keeping covid-19 as well as coronavirus. COVID-19 is the disease caused by infection with the novel SARS-CoV-2 coronavirus. Since we cover both microbiology/virology and some health topics on this site, I can easily imagine on-topic questions where one of the tags is appropriate but not the other. Just my $2e-2.
In principle, these are very different things.
Plenty of theoretical biology contains little or no mathematics; the theory is verbal and conceptual. R.A. Fisher's original model of why there is an even sex ratio provides just one of many examples of elegant work in this vein. George Williams's 1957 paper on the evolution of senescence does include a ...
I agree that they could be synonymized, and have voted. I guess that some might have used the cell tag in a purely descriptive way (Q dealing with cells), but the cell-biology tag should still apply and be more general.
I see the point of joining limnology and freshwater-biology, since they are so close to each other (as @BryanKrause points out, limnology is a bit broader though). However, freshwater-biology is sort of the parallel to the existing (and useful) tag marine-biology (so maybe freshwater-biology should be the "main" tag?). Placing aquatic-biology as a synonym ...
Merged oncology and tumor with cancer and also created oncology as a synonym of cancer. I chose to keep cancer as the primary tag because it is more common and better understood than oncology.
Created a lymphatic-system and merged lymph and
lymphatic with it. Also, synonymised lymph with
Merged and synonymized identification with species-...
RNA and DNA can have very different functions. They're similar molecules, but are generally used for completely different purposes. The tag nucleic-acids is far too broad, even the dna and rna tags still have useful potential subdivisions like ribozymes or rna-interference or dna-quadruplexes.
The actual issue is that the rna and dna tags are overused. ...
You don't have to bother with suggesting synonyms that way, the requirements are so high that it is almost impossible to have a community-created tag synonym on a beta site.
I've created the synonym now and merged the tags.
As I have said before, the tag "virus" would be sufficient as we don't have tags for dozens of viruses of biological importance. But yes, throw the others off and just use "coronavirus" for those few questions that are on-topic here.
As discussed in this Q&A's comments and in fileunderwater's post, I think the best thing to do moving forward is:
freshwater-biology should be made the main tag (i.e., the "master") and limnology be made a synonym.
I think an aquatic-biology tag would be ok to keep in instances where water in general (i.e., irrespective of marine vs ...
plus IMO it is good decision to keep 2 separate tags for book-recommendation and literature; because in spite of a grey-zone between the 2 (actually books are subset of literature) , they would have some practical difference. We commonly look for (1) books when we want to know the basics, the principles, and the brief, ultimate declaration-...
ECM is different from biofilm. Biofilm is a community and a functional biological system in itself (it is not a sort of ECM for bacteria). ECM is not a functional system in itself. You can have an artificial ECM as well (as in the case of coated cell culture flasks).