Invertebrates have a (an) which provides a support framework.

Invertebrates is the largest group in the animal kingdom. 97 percent of all animals are invertebrates. Their main characteristic is that they do not have backbones.
Invertebrates have an exoskeleton which provides a support framework.Exoskeleton is an external anatomical feature that supports and protects the animal's body. 

Explanation:

Collusion is seen as bad for consumers and economic welfare, and therefore collusion is mostly regulated by governments. Collusion can lead to: High prices for consumers. This leads to a decline in consumer surplus and allocative inefficiency (Price pushed up above marginal cost)