1 Which of the following levels of organization are in order from least complex to most complex?
A Organ system = organ = cell molecule
B Molecule cell = organ = organ system
C Cell = molecule = organ system = organ
D Organ = organ system = molecule = cell

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Why do carbohydrate molecules function so well as fuel for the body?

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.