Questions & Answers about La selva es húmeda.
In Spanish, every noun has a grammatical gender, usually masculine or feminine. Selva is a feminine noun, so it takes feminine words with it:
- la selva
- una selva
- selva húmeda
A noun being feminine does not mean the thing itself is biologically female. It is just a grammatical category.
Also, many nouns ending in -a are feminine, and selva follows that common pattern.