What are the m-RNA’s stop codons:

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.

Which is abiotic? a. tree sap b. insect c. sunlight d. wood table

How do light years astronomers to determine the ages of distant objects in space ?