Many of the very good journals have option for applying for waiver of the article processing charges if it is a good research. You can try mega journals such as Scientific Reports and PLOS One. They have a pre-submission waiver policy which do not influence the review process.
Thank you for your question. You can submit your paper on African journal of biotechnology which may do not ask submision fee. But they will ask you publication fee.
There are numbers of journal in biological sciences who don't take article processing charge and some journal who take publication charge or article processing charge have waiving facilities. So it depends on quality of your research work and article you want to publish. Some of reputed publishing group are Elsevier, Springier, Plus One, Trailer and Francis, NPG, BMC, Science, Springier- nature and many more...