Which systems help an organism maintain its structure and shape? A. skin and nervous systems

B. skeletal and muscular
systems

C. endocrine and digestive systems

D. muscular and excretor systems

Which of the following is an example of this type of co-evolution

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

Which example describes a mutualistic relationship between organisms? young wasps prey on caterpillars. crabs eat the remains of dead fish. tapeworms feed on food in the intestines of cats ants protect a tree on which they feed.