What is the main difference between exocrine and endocrine glands? a. exocrine glands secrete substances through a duct; endocrine glands release substances into the blood b. exocrine glands secrete substances into the blood; endocrine glands release substances through a duct c. exocrine glands always secrete substances outside of our bodies; endocrine glands secrete substances within our bodies d. exocrine glands are located outside our bodies; endocrine glands are located inside our bodies?
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