Question

How do spines protect ocean stickleback fish ?

Answer 1

When a Stickleback fish feels threatened, it will flare out its pair of pelvic spines and three dorsal spines, making it difficult for predators to swallow them. 

Answer 2

When threatened, a stickleback can simultaneously flare out its pair of pelvic spines and three dorsal spines, making it difficult for predators to swallow them. age, new freshwater lakes formed as glaciers melted. These lakes provided new breeding grounds for stickleback swimming to these lakes from the ocean.