What controls the water balance between body cells and their environment?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Which type of neuroglia is found outside of the brain?

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service