C ,D,E the endocrine system uses chemical messengers / hormones compound that is produced in one tissue, released into circulation, then has an effect on a different organ ,it doesnt act alone but cooperate with nervous or other systems and then interact with other cells. Hormones are specific target cells
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The answer is A. A human has 46 chromosomes, 23 from the mom and 23 from the dad. Each are equal from parent to parent.
The answer is C. dead leaves