What us mitochondria sometimes referred as the what of the cell

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream

What percentage of light hits earth's surface directly?

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false