The sentence you wrote is mostly clear, but it can be improved a little for better grammar and clarity. Here's your original sentence:
"Platypus burrows have two entrances. One is underwater, the other is hidden in bank plants."
To make it better, you can join the two parts with a word like "and" instead of a comma because they are two complete sentences. Here is a corrected version:
"Platypus burrows have two entrances: one is underwater, and the other is hidden in plants on the bank."
Explanation:
- Use a colon ':' after 'entrances' to introduce the two entrances.
- Use 'and' to connect the two parts because they are closely related.
- Change 'bank plants' to 'plants on the bank' for clearer meaning.
This sentence tells us that platypus burrows have two different ways to enter: one underwater and one hidden among plants growing on the riverbank.