13. What is the pH of a very acidic solution?
A. 14
B. 10
C. 1
D. 5

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

What did hunter gathers do to alter the environment?

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