When zinc is placed in hydrochloric acid (HCl). hydrogen gas and zinc chloride are produced. How many grams of HCl would need to react to produce 3.21 grams of hydrogen gas? Zn + 2HCl --> ZnCl2 + H2 a 115.88 g HCl b 84.83 g HCl c 28.38 g HCl d 42.42 g HCl

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.

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Coral have a symbiotic relationship with what in order to eat?