Fish
100
Most fish breathe through this part of their body.
What are gills?
200
How the Japanese mud skipper breathes.
What is air through its skin?
300
Most boundary disputes never end because of this problem.
What is a lack of living space?
400
This is how most fish eggs are fertilized by the male fish.
What is preading the sperm over the top of the eggs?
500
This what fish eggs are called.
What is roe?
M
e
n
u