The backbone of dna and rna is composed of?

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

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

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?