What is a structure in organisms that do not have kidneys?

Malphigian tubules - specialized structures in insects and spiders that absorb water and ions then pass it to the gut. Antennal glands - found in crustaceans like crabs and shrimps. Functions in reabsorption of substances, secretion and removal through urine.

Explanation:

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.