Learn Danish: Begge biologer beskytter naturreservatet. - Both biologists protect the nature reserve.

You use begge to when it stands alone as a pronoun (like saying 'we are both coming'). But when 'both' is placed directly in front of a noun, like biologer, you only use begge.

Why is biologer in the indefinite form?

In Danish, begge is followed by the indefinite plural form of the noun. So 'both biologists' is simply begge biologer, rather than begge biologerne.

How do we know the gender of a long compound word like naturreservatet?

For compound words, the gender is always decided by the last part. Reservat is an et-word, so naturreservat is also an et-word. That is why it takes the -et ending to mean 'the nature reserve'.

Does the verb beskytter change because the subject is plural?

Just a quick refresher: Danish verbs never change based on who or how many people are doing the action! Whether one person or two biologists are doing it, the present tense verb is always beskytter.