Final answer:
Insects have excretory tubules known as Malpighian tubules. These tubules are responsible for removing nitrogenous wastes and other solutes from the insect's blood.
Step-by-step explanation:
Insects have excretory tubules known as Malpighian tubules. These tubules are found in the digestive system of insects and are responsible for removing nitrogenous wastes and other solutes from the insect's blood. Malpighian tubules work with specialized glands in the rectum to excrete concentrated waste.