Queries on regression analysis

We have the data of "gall_diameter" and "elevations". Our objective is to
see how does gall diameter vary along the elevation gradient. In our case
the elevation gradient refers to the range between 1500 to 2500 m asl with
data collected in every 250 m interval.
Our data did not follow normal distribution. Gall_diameter is a continuous
dependent variable. Can we apply "glm" to see the relationship between
gall-diameter and elevation in our case?
How can we decide the distribution in our data and its family?
Thank you all in advance for your help.

*Chitra Bahadur Baniya, M Sc, M Phil, PhDAssociate ProfessorCentral
Department of BotanyTribhuvan UniversityKirtipurKathmandu, Nepal*
orcid.org/0000-0002-8746-7601

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