John had 3 apples then shared 2 with his friends how many are left

What is the name of the tool scientists use to identify a species? species key dichotomous key species marker dichotomous marker

3paragraph about medical terminology

How does the endocrine system affect the body's functions? o o o o it secretes enzymes directly into the bloodstream. it secretes hormones directly into the bloodstream. it secretes enzymes through ducts to the surface of organs. it secretes hormones through ducts to the surface of organs.